REVERSIBLE FOLDING RIFLE STOCK

CROSS REFERENCE TO RELATED APPLICATIONS

[0001]The present application claims priority under 35 U.S.C. § 119 and PCT Article 8, Rule 4.10 to U.S. Provisional Application No. 63/635,706 entitled “BIDIRECTIONAL FOLDING RIFLE STOCK”, filed on Apr. 18, 2024, which is hereby incorporated by reference herein in its entirety and for all purposes.

FIELD

[0002]The present disclosure relates generally to a reversible folding rifle stock. In particular, but not by way of limitation, the present disclosure relates to systems, methods and apparatuses for multi-platform reversible folding stocks with vertical and longitudinal adjustability.

BACKGROUND

[0003]Firearms with gas operated piston systems generally do not require a receiver extension to function since the case ejection and reloading system are housed within the bounds of the upper receiver assembly. Because of this, a folding buttstock can be employed since it typically does not house components extending from the receiver. Historically, folding buttstocks were designed for a specific (non-modular) weapon, had a fixed length of pull (“LOP”), and could only be folded to one side of the receiver as they were intended mostly for use on the specific firearm for which they were designed, typically firearms for right-handed use.

[0004]Ideally, a firearm is fully functional regardless of whether the stock is folded or not. When folded, the stock ideally avoids physical interference with other weapon features and functions, such as movement of a bolt handle or cartridge case ejection from the ejection port, while providing the user with full access to the safety, magazine release, and other controls. Since traditional stocks are mounted to a static platform and do not extend in length, designing them to retain partial weapon function in the folded position was straightforward.

[0005]While there are examples of folding buttstocks which may be assembled to fold either to the right- or left-hand side of the weapon, these are primarily for bolt-action rifles. These rifles are typically not used in a reactionary or defensive situation where the weapon may need to be fired before deployment of a folded stock is possible. Thus, the folding does not account for partial or full access to control surfaces when folded, since the stock is expected to be deployed (unfolded) prior to use. In contrast, automatic and semi-automatic weapons (rifles, carbines, submachineguns, pistol-caliber carbines, personal defense weapons (PDWs), etc.) are expected to be functional even when folded. Often these guns have controls such as charging handles, magazine releases, safety/selector switches and bolt releases that interfere with folding stocks on a given side.

[0006]The information included in this Background section of the specification is included for technical reference purposes only and is not to be regarded subject matter by which the scope of the present disclosure is to be bound.

SUMMARY

[0007]Given increasing demand for ambidextrous firearms, there is a need for an ambidextrous and/or reversible folding stock. For example, left-handed operations are typically better supported by a folding stock that folds in a first direction and right-handed operations are typically better supported by a folding stock that folds in a second direction opposite the first direction. Additionally, since many side-protruding features are typically collocated on a single side of a firearm, a better storage profile may also be achieved. For example, a firearm configured primarily for left-handed use will typically have side-protruding features on a side of the firearm that is opposite than the side the side-protruding features are located on of a firearm configured primarily for right-handed. Thus, it is beneficial to have a stock that can fold in both the typical direction, e.g., for use with firearms configured primarily for right-handed use, and a direction that is opposite the typical folding stock direction, e.g., for use with firearms configured primarily for left-handed use.

[0008]Similarly, enabling a reversible direction of fold may benefit some configurations by offering improved control access or even just weapon feature clearance, such as to avoid interference with charging handles, ejection ports, e.g., for proper spent casing ejection when using accessories such as a cheek riser, and other relevant functional features or components. Additionally, a reversible fold direction can be beneficial by offering additional user preference options, ease-of-deployment functionality, and/or additional storage options, as compared to traditional stocks. For example, a firearm designed for use by a right-handed user may still include features that cause interference when the firearm is coupled with a stock also designed for use by a right-handed user. Thus, providing additional user preference options and improvements to deployment and storage configurations is beneficial regardless of a user's handedness.

[0009]In some aspects, the techniques described herein relate to a stock system for mounting to a rearward facing rail, including: a housing configured to couple with a distal end of a stock, wherein the housing defines a first groove and a second groove; and a clamp system including: a first clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the first clamp and the second protrusion extends from a second end of the first clamp; and a second clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the second clamp and the second protrusion extends from a second end of the second clamp; wherein the first protrusion of the first clamp is configured to couple with the first groove of the housing and the first protrusion of the second clamp is configured to couple with the second groove of the housing; wherein the second protrusion of the first clamp is configured to couple with the rearward facing rail and the second protrusion of the second clamp is configured to couple with the rearward facing rail.

[0010]In some aspects, the techniques described herein relate to a stock system, wherein the first protrusion of the first clamp is configured to couple with the second groove of the housing and the first protrusion of the second clamp is configured to couple with the first groove of the housing.

[0011]In some aspects, the techniques described herein relate to a stock system, wherein the clamp system further includes: a fastener; wherein, with the first protrusion of the first clamp coupled with the first groove and the first protrusion of the second clamp coupled with the second groove, the fastener couples with the first clamp and the second clamp, wherein movement between the first clamp and the second clamp is inhibited in response to the coupling of the fastener with the first clamp and the second clamp.

[0012]In some aspects, the techniques described herein relate to a stock system, wherein the fastener is coupled with the first clamp and the second clamp at a location offset from a center point of the first clamp and at a location offset from a center point of the second clamp, respectively.

[0013]In some aspects, the techniques described herein relate to a stock system, wherein: the location offset from the center point of the first clamp is greater than or equal to about 5 mm and less than or equal to about 10 mm from the center point of the first clamp; and the location offset from the center point of the second clamp is greater than or equal to about 5 mm and less than or equal to about 10 mm from the center point of the second clamp.

[0014]In some aspects, the techniques described herein relate to a stock system, further including: a hinge assembly configured to couple with the stock in a first orientation and in a second orientation, wherein the housing at least partially covers portions of the hinge assembly with the housing coupled with the distal end of the stock and the hinge assembly coupled with the stock, the hinge assembly including: a first portion; a second portion, wherein the first portion and the second portion are configured to interface; a hinge coupled with the first portion and the second portion; and one or more bushings shaped to interface with one or more clevises, wherein the one or more bushings are biased into a corresponding clevis of the one or more clevises; wherein one of the first portion or the second portion is configured to rotate around a pivot axis of the hinge; wherein the first portion and the second portion separate in response to the rotation of the one of the first portion or the second portion around the pivot axis; and wherein the one or more bushings translate vertically in response to the separation of the first portion and the second portion.

[0015]In some aspects, the techniques described herein relate to a stock system, further including: a LOP rail defining a plurality of apertures; and a LOP locking assembly configured to enable a LOP adjustment, the LOP locking assembly including: a paddle button; and a pawl rotationally coupled with the paddle button; wherein, upon actuation of the paddle button, the pawl is configured to disengage a first aperture of the plurality of apertures of the LOP rail; and wherein, upon release of the paddle button, the pawl is configured to engage the first aperture or a second aperture of the plurality of apertures of the LOP rail.

[0016]In some aspects, the techniques described herein relate to a stock system, further including: a sling mount assembly configured to enable coupling with a sling, the sling mount assembly including: a cup; a plug; and a fastener; wherein the stock defines a hole extending through a thickness of the stock; wherein the fastener extends through the hole and couples with the cup and the plug, thereby coupling the cup and the plug to each other; and the sling mount assembly is reversible.

[0017]In some aspects, the techniques described herein relate to a stock system, wherein the stock defines a slot, the stock system further including: a cheek riser adjustment assembly configured to enable coupling with a sling, the cheek riser adjustment assembly including: one or more cheek risers of different height; wherein a portion of the one or more cheek risers couples with the slot; and wherein the one or more cheek risers are reversible.

[0018]In some aspects, the techniques described herein relate to a stock system including: a hinge assembly configured to couple with an upper stock body of a stock and a firearm receiver, the hinge assembly including: a first portion; a second portion, wherein the first portion and the second portion are configured to interface; a hinge coupled with the first portion and the second portion; and one or more bushings shaped to interface with one or more clevises, wherein the one or more bushings are biased into a corresponding clevis of the one or more clevises; wherein one of the first portion or the second portion is configured to rotate about a pivot axis of the hinge; wherein the first portion and the second portion separate in response to the rotation of the one of the first portion of the second portion around the pivot axis; and wherein the one or more bushings translate vertically in response to the separation of the first portion and the second portion.

[0019]In some aspects, the techniques described herein relate to a stock system, further including a hinge button, wherein: the hinge includes a hinge pin, the hinge pin defines the pivot axis; the first portion includes the one or more clevises; the one or more clevises include a first clevis and a second clevis, the first clevis receives a first portion of the hinge pin and the second clevis receives a second portion of the hinge pin; the one or more bushings include a first bushing and a second bushing, wherein the first bushing and the second bushing slidably couple with the hinge pin between the first clevis and the second clevis; and the first portion is configured to rotate around the hinge pin in response to activation of the hinge button.

[0020]In some aspects, the techniques described herein relate to a stock system, wherein: the hinge assembly is configured to couple with the upper stock body in a first orientation and in a second orientation; and the second orientation of the hinge assembly includes a 180 degree rotation of the hinge assembly from the first orientation of the hinge assembly.

[0021]In some aspects, the techniques described herein relate to a stock system, further including: a housing coupled with a distal end of the stock, wherein the housing defines a first groove and a second groove; and a clamp system including: a first clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the first clamp and the second protrusion extends from a second end of the first clamp; and a second clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the second clamp and the second protrusion extends from a second end of the second clamp; wherein the first protrusion of the first clamp is configured to couple with the first groove of the housing and the first protrusion of the second clamp is configured to couple with the second groove of the housing; wherein the second protrusion of the first clamp is configured to couple with the firearm receiver and the second protrusion of the second clamp is configured to couple with the firearm receiver.

[0022]In some aspects, the techniques described herein relate to a stock system, further including: a LOP rail defining a plurality of apertures; and a LOP locking assembly configured to enable a LOP adjustment, the LOP locking assembly including: a paddle button; and a pawl rotationally coupled with the paddle button; wherein, upon actuation of the paddle button, the pawl is configured to disengage a first aperture of the plurality of apertures of the LOP rail; and wherein, upon release of the paddle button, the pawl is configured to engage the first aperture or a second aperture of the plurality of apertures of the LOP rail.

[0023]In some aspects, the techniques described herein relate to a stock system, further including: a sling mount assembly configured to enable coupling with a sling, the sling mount assembly including: a cup; a plug; and a fastener; wherein the stock defines a hole extending through a thickness of the stock; wherein the fastener extends through the hole and couples with the cup and the plug, thereby coupling the cup and the plug to each other; and the sling mount assembly is reversible.

[0024]In some aspects, the techniques described herein relate to a stock system, wherein the stock defines a slot, the stock system further including: a cheek riser adjustment assembly configured to enable coupling with a sling, the cheek riser adjustment assembly including: one or more cheek risers of different height; wherein a portion of the one or more cheek risers couples with the slot; and wherein the one or more cheek risers are reversible.

[0025]In some aspects, the techniques described herein relate to a stock system including: a housing coupled with a distal end of a stock, wherein the housing defines a first groove and a second groove; a hinge assembly configured to couple with the stock in a first orientation and in a second orientation and couple with a firearm receiver, the hinge assembly including: a first portion; a second portion, wherein the first portion and the second portion are configured to interface; and a hinge coupled with the first portion and the second portion; a clamp system including: a first clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the first clamp and the second protrusion extends from a second end of the first clamp; and a second clamp including a first protrusion and a second protrusion, wherein the first protrusion extends from a first end of the second clamp and the second protrusion extends from a second end of the second clamp, wherein the first protrusion of the first clamp is configured to couple with the first groove of the housing and the first protrusion of the second clamp is configured to couple with the second groove of the housing; wherein the second protrusion of the first clamp is configured to couple with the firearm receiver and the second protrusion of the second clamp is configured to couple with the firearm receiver; wherein one of the first portion or the second portion of the hinge assembly and the clamp system are configured to rotate about a pivot axis of the hinge.

[0026]In some aspects, the techniques described herein relate to a stock system, further including: a LOP rail defining a plurality of apertures; and a LOP locking assembly configured to enable a LOP adjustment, the LOP locking assembly including: a paddle button; and a pawl rotationally coupled with the paddle button; wherein, upon actuation of the paddle button, the pawl is configured to disengage a first aperture of the plurality of apertures of the LOP rail; and wherein, upon release of the paddle button, the pawl is configured to engage the first aperture or a second aperture of the plurality of apertures of the LOP rail.

[0027]In some aspects, the techniques described herein relate to a stock system, further including: a sling mount assembly configured to enable coupling with a sling, the sling mount assembly including: a cup, a plug; and a fastener; wherein the stock defines a hole extending through a thickness of the stock; wherein the fastener extends through the hole and couples with the cup and the plug, thereby coupling the cup and the plug to each other; and the sling mount assembly is reversible.

[0028]In some aspects, the techniques described herein relate to a stock system, wherein the stock defines a slot, the stock system further including: a cheek riser adjustment assembly configured to enable coupling with a sling, the cheek riser adjustment assembly including: one or more cheek risers of different height; wherein a portion of the one or more cheek risers couples with the slot; and wherein the one or more cheek risers are reversible.

[0029]Accordingly, there is provided a stock as detailed in the respective independent claims. A stock per the independent claim is also provided. Advantageous features are provided in the dependent claims.

[0030]In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the drawings and by study of the following description. For example, this Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. A more extensive presentation of features, details, utilities, and advantages of the present invention as defined in the claims is provided in the following written description of various embodiments and implementations and illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0031]The disclosure can be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:

[0032]FIG. 1 depicts an isometric view of an embodiment of a folding rifle stock;

[0033]FIG. 2 depicts a partially exploded view of an embodiment of a folding rifle stock;

[0034]FIG. 3 depicts a side view of an embodiment of a folding rifle stock;

[0035]FIG. 4 depicts a partial view of an embodiment of a folding rifle stock;

[0036]FIG. 5 depicts a partial view of an embodiment of a folding rifle stock;

[0037]FIG. 6 depicts a partial cross-sectional view of a portion of an embodiment of a folding rifle stock;

[0038]FIG. 7 depicts a partial exploded view of an embodiment of a folding rifle stock;

[0039]FIG. 8 depicts a partial exploded view of an embodiment of a folding rifle stock,

[0040]FIG. 9A depicts a partial exploded view of an embodiment of a folding rifle stock;

[0041]FIG. 9B depicts a partial exploded view of an embodiment of a folding rifle stock;

[0042]FIG. 10 depicts a partial exploded view of an embodiment of a hinge assembly of a folding rifle stock;

[0043]FIG. 11A depicts an isometric view of an embodiment of a hinge assembly of a folding rifle stock in an open position;

[0044]FIG. 11B depicts an isometric view of an embodiment of a hinge assembly of a folding rifle stock in an open position;

[0045]FIG. 12A depicts a partial view of an embodiment of a firearm assembly including a rail adapter;

[0046]FIG. 12B depicts an isometric view of an embodiment of a rail adapter;

[0047]FIG. 12C depicts a front view of an embodiment of a rail adapter,

[0048]FIG. 12D depicts a top view of an embodiment of a rail adapter;

[0049]FIG. 12E depicts a top isometric view of an embodiment of a rail adapter;

[0050]FIG. 13A depicts an isometric view of an embodiment of a folding rifle stock including a clamp system in a first orientation;

[0051]FIG. 13B depicts an isometric view of an embodiment of a folding rifle stock including a clamp system in a second orientation;

[0052]FIG. 14A depicts an isometric view of an embodiment of a rail adapter coupled with a folding rifle stock including a clamp system in a first orientation;

[0053]FIG. 14B depicts an isometric view of an embodiment of a rail adapter coupled with a folding rifle stock including a clamp system in a second orientation;

[0054]FIG. 15A depicts an isometric view of an embodiment of a firearm coupled with a folding rifle stock including a clamp system in a first orientation;

[0055]FIG. 15B depicts an isometric view of an embodiment of a firearm coupled with a folding rifle stock including a clamp system in a second orientation;

[0056]FIG. 16A depicts a partial exploded view of a folding rifle stock including a hinge assembly in a first orientation;

[0057]FIG. 16B depicts a partial exploded view of a folding rifle stock including a hinge assembly in a second orientation;

[0058]FIG. 17A depicts a partial exploded view of a folding rifle stock including a hinge assembly in a first orientation;

[0059]FIG. 17B depicts a partial exploded view of a folding rifle stock including a hinge assembly in a second orientation;

[0060]FIG. 18A depicts an isometric view of a folding rifle stock including a hinge assembly in a first orientation and in a closed position,

[0061]FIG. 18B depicts an isometric view of a folding rifle stock including a hinge assembly in a second orientation and in a closed position;

[0062]FIG. 19A depicts an isometric view of a folding rifle stock including a hinge assembly in a first orientation and in an open position;

[0063]FIG. 19B depicts an isometric view of a folding rifle stock including a hinge assembly in a first orientation and in an open position;

[0064]FIG. 20A depicts an isometric view of a folding rifle stock including a hinge assembly in a second orientation and in an open position;

[0065]FIG. 20B depicts an isometric view of a folding rifle stock including a hinge assembly in a second orientation and in an open position;

[0066]FIG. 21 depicts an exploded view of a folding rifle stock including a cheek riser adjustment assembly;

[0067]FIG. 22A depicts an isometric view of a folding rifle stock including a cheek riser adjustment assembly in a first orientation,

[0068]FIG. 22B depicts an isometric view of a folding rifle stock including a cheek riser adjustment assembly in a second orientation;

[0069]FIG. 23A depicts an isometric view of a folding rifle stock including a cheek riser adjustment assembly in a first orientation;

[0070]FIG. 23B depicts an isometric view of a folding rifle stock including a cheek riser adjustment assembly in a second orientation;

[0071]FIG. 24 depicts an isometric view of an embodiment of a stock;

[0072]FIG. 25 depicts an exploded view of an embodiment of a lever and lock pin system; and

[0073]FIG. 26 depicts a partial view of an embodiment of a lever and lock pin system coupled with an LOP rail.

[0074]This Brief Description of the Drawings is not intended to identify essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. A more extensive presentation of features, details, utilities, and advantages of the present disclosure is provided in the following written description of various embodiments of the claimed subject matter and illustrated in the accompanying drawings.

DETAILED DESCRIPTION

[0075]Prior to describing the embodiments in detail, it is expedient to define terms as used in this document. The word “herein” includes the descriptions provided throughout this specification, including the Cross-Reference to Related Applications, Field, Background, Summary, Brief Description of the Drawings, Detailed Description, Claims, and Abstract. As used herein, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. As used herein, the terms “about” and “substantially” herein are to be construed as +/−10%. unless stated otherwise. As used herein, every range of values (such as of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b” or, equivalently, “greater than about a and less than about b”, for example) disclosed herein is to be understood to set forth every number and range encompassed within the broader range of values. As used herein, the term “and/or” when used in the context of a listing of entities, refers to the entities being present singly or in combination. Thus, for example, the phrase “A, B, C, and/or D” includes A, B, C, and D individually, but also includes any and all combinations and sub-combinations of A, B, C, and D.

[0076]As used herein, the terms “first”, “second”, “third” etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections and should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure.

[0077]As used herein, spatially relative terms, such as “beneath”, “below”, “lower”, “under”, “above”, “upper”, “over”, and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or system, e.g., in use or operation in addition to the orientation depicted in the figures. For example, if the device or system in the figures is turned over, elements described as “below” or “beneath” or “under” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary terms “below” and “under” can encompass both an orientation of above and below. The device or system may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein are to be interpreted accordingly. In addition, it will also be understood that when an object or component is referred to as being “between” two objects or components, the object or component can be the only object or component between the two objects or components, or one or more additional objects or components may also be present.

[0078]The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a,” “an,” and “the” are to be construed as open ended, e.g., meaning “at least one”, and as such are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or groups but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items and may be abbreviated as “/”. For example, the term “and/or” when used in the context of a listing of entities, refers to the entities being present singly or in combination, and the phrase “A, B, C, and/or D” includes A, B, C, and D individually, but also includes any and all combinations and sub-combinations of A, B, C, and D.

[0079]As used herein, when an element is referred to as being “on,” “connected,” “attached,” “mounted,” “coupled,” or “adjacent” another element, it can be directly on, connected, coupled, or adjacent to the other element, or intervening elements may be present. For example, as used herein, the term “adjacent” can mean next to, neighboring, or abutting and in contact, but does not necessarily mean in contact unless otherwise stated. In contrast, when an element is referred to as being “directly on,” “directly connected,” “directly coupled,” or “immediately adjacent” another element, there are no intervening elements present. As used herein, the phrases “connected,” “attached,” “mounted,” “coupled,” and the like can be used interchangeably. For example, these terms can be used herein to mean a removable coupling, a fixed coupling, a movable coupling, a fixedly removable couple, a permanent coupling, and the like, unless explicitly stated otherwise.

[0080]It should be understood that logical operations may be performed in any order, unless explicitly claimed otherwise or a specific order is inherently necessitated by the claim language. Additionally, some of the operations described may be skipped or not included in described methodologies. For example, in methodologies directly or indirectly set forth herein, various steps and operations are described in one possible order of operation but those skilled in the art will recognize the steps and operation may be rearranged, replaced, or eliminated without necessarily departing from the spirit and scope of the present disclosure. It is intended that all matter contained in the description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the spirit of the present disclosure as defined in the appended claims.

[0081]For the purpose of this document, relational terms used herein, such as without limitation, “lateral”, “longitudinal”, “perpendicular”, “parallel”, and “flat” shall be understood to mean “within reasonable manufacturing tolerances accepted in the firearm manufacturing industry”. The term “longitudinal” shall reference that direction associated with a typical bullet travel down a barrel of the firearm. The term “fore” shall reference that side or direction associated with a firing direction or a nose of a cartridge (e.g., a muzzle end of the firearm), while the term “aft” shall reference that side or direction associated with a user position, away from a firing direction (e.g., a butt end of the firearm).

[0082]The term “distal” shall be understood to reference those components or a direction approaching the end of a stock or a firearm from which rounds leave when fired, or furthest from a butt pad of a firearm or stock. The term “proximal” shall be understood to reference those components or a direction opposing a distal end 191 of the UCS 100. For example, in FIG. 1, a butt pad 104c can be located at or near a proximal end 190 of the stock 100. For example, the term “proximal” may refer to an object, such as a first component of the stock, that is closer to a user in an operational orientation than another object, such as a second component of the stock.

[0083]Embodiments of the disclosure are described herein with reference to cross-section illustrations that are schematic illustrations of embodiments (and intermediate structures) of the disclosure. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the disclosure should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Accordingly, the regions illustrated in the figures are schematic in nature and their shapes are not necessarily intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the disclosure.

[0084]Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and/or the present specification and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0085]While unidirectional folding stocks are suitable in many instances, there are advantages to having ambidextrous and/or reversible folding stocks. For instance, left-handed operations, especially on weapons that feature left-handed (or reversible) ejection ports, side charging handles, selectors or other controls are better supported by a left-folding stock. A better storage profile may also be a benefit especially for weapons configured primarily for left-handed use since many side-protruding features can be collocated on the same side thus reducing overall width. Additionally, enabling a reversible direction of fold may benefit some configurations by offering improved control access or even just clearance, such as for proper spent casing ejection when using accessories such as a cheek riser. Additionally, a reversible fold direction can be beneficial by offering additional user preference options, ease-of-deployment functionality, and/or additional storage options, as compared to traditional stocks.

[0086]What is needed is multi-platform reversible folding stocks including features such as adjustable LOP and accessory add-ons, such as cheek risers, rubberized butt pads, and the like. Additionally, multiple methods of adjustment are needed to adapt around the myriad platforms and configurations that may be encountered. Factors such as reducing the bulk of the stock and vertical adjustability in mounting are important for obtaining various clearances, as well as reducing a profile of the stock while still providing a multitude of adjustment offerings.

[0087]FIG. 1 depicts an embodiment of a stock extension or stock 100. The stock 100 can mount to or with weapon platforms. For example, the stock 100 can mount to weapon platforms including a rearward facing rail, such as a 1913 Picatinny rail. The stock 100 and/or features of the stock 100 and/or features coupled with the stock 100 can enable or permit adjustments, such as adjustments to the orientation of the stock 100 with respect to the weapon platform, e.g., with the stock 100 mounted to the weapon platform. In these examples, the stock 100 and the features of the stock 100 and/or the features coupled with the stock 100 that can enable or permit the adjustments can be referred to herein as a stock system. The adjustments enabled or permitted by the stock 100 can include stock height; rotational folding direction; length of pull (LOP), which includes the overall length dimension from a butt end of a stock to a front of a trigger; sling mount position, and/or cheek riser or weld height. For example, the embodiments of the stock 100 described herein can include one or more of the components that enable one or more of these adjustments but may be structured so as to not include one or more of the components that enable one or more of these adjustments. In some embodiments, the stock 100 can be modular such that partial disassembly permits the stock 100 to be used with some pre-existing, AR-type collapsible carbine butt stocks, such as the Magpul CTR. In view of these modularity and adjustment features of the stock 100, the stock 100 may be referred to herein as a Universal Carbine Stock (UCS) 100.

[0088]The stock 100 can include a lower stock body 104a and an upper stock body 104b. The lower stock body 104a can include a longitudinal axis substantially orthogonal or oblique to a longitudinal axis 127 of the upper stock body 104b. For example, the lower stock body 104a and the upper stock body 104b can be coupled together or otherwise formed as one integral structure. For example, the lower stock body 104a can extend from a proximal portion of the upper stock body 104b. For example, the lower stock body 104a and the upper stock body 104b can form or define a corner shape.

[0089]The stock 100 can include a butt pad 104c. The butt pad 104c can be or can include flexible materials, such as rubber, soft polymer, foam, and the like. In some examples, the butt pad 104c can be or can include hard materials, such as steel, Polyethylene Terephthalate, and the like. The butt pad 104c can be arranged or located at or near the proximal end 190 of the stock 100. For example, the proximal end 190 of the stock 100 can contact a user object, such as a shoulder region of a user, and the butt pad 104c can be received by the user object, e.g., in an operational orientation of the stock 100. The butt pad 104c can include angled edges, which can correspond to or align with the shape of the user object. The angled edges can promote comfortable positioning of the stock 100, e.g., in an operational orientation, and thus can enable more efficient LOP adjustments and shoulder transitions of the stock 100.

[0090]The stock 100 can include a housing or housing assembly 114a. The housing assembly 114a can include a first housing 114b, such as a proximal end housing, a second housing 114c, such as a distal end housing, and a housing interface 114d. The housing interface 114d can be an interface between the first housing 114b and the second housing 114c. For example, the first housing 114b and the second housing 114c can interface with each other at the housing interface 114d. The first housing 114b and the second housing 114c can separate from each other along the housing interface 114d, as discussed further herein.

[0091]The housing assembly 114a can couple with the stock 100, e.g., the first housing 114b, such as a proximal end housing, can couple with the distal end 191 of the stock 100. For example, the housing assembly 114a can couple with the upper stock body 104b at a distal end of the upper stock body 104b. The housing assembly 114a and/or components thereof can couple with components of the stock 100, as discussed herein. For example, the housing assembly 114a and/or components thereof can include a shape formed to interface with components of the stock 100. The housing assembly 114a and/or components thereof can cover components of the stock 100, as discussed herein.

[0092]The stock 100 can include a receiver interface area 104d. The receiver interface area 104d can be arranged or located at a distal end 191 of the stock 100. For example, the receiver interface area 104d can face away from a user in an operational orientation of the stock 100. The distal end 191 of the stock 100 can couple with a weapon platform or firearm receiver, such as a rearward facing rail. For example, the stock 100 can be mounted to the weapon platform or firearm receiver, such as the rearward facing rail. For example, the receiver interface area 104d can receive a portion of a rail, such as a rearward facing rail. The receiver interface area 104d can be sized or shaped to correspond to the rail. For example, the receiver interface area 104d can include extensions that interface with the detents or slots of the rail, or the receiver interface area 104d can include detents that interface with portions of the rail.

Stock Height Adjustment and Mounting Features of the UCS 100

[0093]The UCS 100 can include or couple with a clamp system 103, as depicted in FIG. 1 among others. For example, the clamp system 103 and components thereof can removably or permanently couple with the UCS 100. For example, the clamp system 103 can be a removably attachable component of the UCS 100. In these embodiments, the UCS 100 and the clamp system 103 can be referred to herein as the stock system, e.g., for mounting to a rearward facing rail. In other examples, the clamp system 103 can be an integral component of the UCS 100. The clamp system 103 can include at least one clamp, such as a first clamp 105a and a second clamp 105b. In embodiments where the clamp system 103 includes the two clamps 105a, 105b, the clamp system 103 may be referred to herein as a dual clamp system.

[0094]The clamps 105a, 105b can each define a hole 117 extending through at least a portion of the thickness of each of the respective clamps 105a, 105b, e.g., the holes can each extend through the entire thickness of each of the respective clamps 105a, 105b, or only a percentage of the thickness of each of the respective clamps 105a, 105b, such as about 25%, 50%, 75%, or 90%. The middle portion 108c of each of the clamps 105a, 105b can define the respective holes 117. Each of the respective holes 117 of the clamps 105a, 105b can be located at the same position on each of the respective clamps 105a, 105b. For example, the clamps 105a, 105b can be substantially structurally identical, such that in an operational orientation of the UCS 100, the holes 117 can be aligned with each other, symmetrically facing each other, opposite each other, or the like.

[0095]The holes 117 can be defined asymmetrically by the clamps 105a, 105b. For example, the holes 117 can be defined at an offset from a center point of the clamps 105a, 105b and/or the center point of the middle portion 108c of each of the clamps 105a, 105b. In some examples, the offset can be a location above or below the center point of the clamps 105a, 105b and/or the center point of the middle portion 108c. In other examples, the offset can be a location to the right or left of the center point of the clamps 105a, 105b and/or the center point of the middle portion 108c. In other examples, the offset can be a location above, below, right, and/or left of the center point of the clamps 105a, 105b and/or the center point of the middle portion 108c.

[0096]The holes 117 can be defined greater than or equal to about Imm and less than or equal to about 19 mm from a center point of the clamps 105a, 105b and/or the center point of the middle portion 108c of each of the clamps 105a, 105b. For example, the holes 117 can be defined greater than or equal to about 5 mm and less than or equal to about 10 mm. For example, the holes 117 can be defined about 5 mm or about 10 mm from a center point of the clamps 105a, 105b. For example, the holes 117 can be defined about 5 mm or about 10 mm from a center point of the middle portion 108c of each of the clamps 105a, 105b. The geometry of the clamps 105a, 105b can be symmetrical from top to bottom and/or left to right. The symmetrical geometry of the clamps 105a, 105b can enable or permit the rotation of the clamps 105a, 105b, e.g., 180°, which can enable adjustments of the UCS 100 as described herein, such as stock height adjustment.

[0097]The first clamp 105a and the second clamp 105b can each include a rear portion or surface 108a, a front portion or surface 108b, and a middle portion or surface 108c, as depicted in FIG. 8 among others. In some examples, the middle portion or surface 108c can be defined as the portion or surface between the rear portion or surface 108a and the front portion or surface 108b. The first clamp 105a and the second clamp 105b can each include a rear inner portion or surface 109a and a front inner portion or surface 109b. In some examples, the middle portion or surface 108c can be defined as the portion of surface between the rear inner portion or surface 109a and the front inner portion or surface 109b. The term “rear” can mean a portion or surface that is closer to the lower stock body 104a or the upper stock body 104b of the UCS 100 than to the rail 1205, e.g., in an operational orientation of the UCS 100 or in an orientation of the UCS 100 mounted to the rail 1205. The term “front” can mean a portion or surface that is closer to the rail 1205 than to the lower stock body 104a or the upper stock body 104b of the UCS 100, e.g., in an operational orientation of the UCS 100 or in an orientation of the UCS 100 mounted to the rail 1205.

[0098]The clamps 105a, 105b can each include at least one tooth, such as a protrusion, an extension, a lip, or the like. For example, the first clamp 105a and the second clamp 105b can each include a first protrusion 107a and a second protrusion 107b, as depicted in FIGS. 6 and 8 among others. The first protrusion 107a and the second protrusion 107b may be referred to herein as a set of teeth or protrusions. For example, the clamps 105a, 105b can each include a set of teeth or protrusions and the set of teeth or protrusions can each include the first protrusion 107a and the second protrusion 107b.

[0099]The first protrusion 107a and the second protrusion 107b can extend from opposite sides or ends of each of the respective clamps 105a, 105b, e.g., from the rear portion 108a and from the front portion 108b, respectively. For example, the first protrusion 107a can extend from a first end, e.g., the rear portion 108a, of each of the respective clamps 105a, 105b, and the second protrusion 107b can extend from a second end, e.g., the front portion 108b, of each of the respective clamps 105a, 105b. For example, the first end and the second end of each of the respective clamps 105a, 105b can be opposite each other, and the first protrusion 107a and the second protrusion 107b can be opposite each other. The first protrusion 107a and the second protrusion 107b can each define a thickness of each of the respective clamps 105a, 105b. For example, the thickness of the clamps 105a, 105b defined by the first protrusion 107a and/or the second protrusion 107b can be greater than a thickness of the clamps 105a, 105b defined by a body portion, e.g., the middle portion 108c, of each of the respective clamps 105a, 105b. For example, the body portion of each of the respective clamps 105a, 105b can be defined as the portion between the first protrusion 107a and the second protrusion 107b.

[0100]The first protrusion 107a and the second protrusion 107b can extend along a. length or a width of each of the respective clamps 105a, 105b. For example, the first protrusion 107a of the first clamp 105a can extend along a first length of the first clamp 105a and the second protrusion 107b of the first clamp 105a can extend along a second length of the first clamp 105a, or the first protrusion 107a of the first clamp 105a can extend along a first width of the first clamp 105a and the second protrusion 107b of the first clamp 105a can extend along a second width of the first clamp 105a. For example, the first protrusion 107a of the second clamp 105b can extend along a first length of the second clamp 105b and the second protrusion 107b of the second clamp 105b can extend along a second length of the first clamp 105a, or the first protrusion 107a of the second clamp 105b can extend along a first width of the second clamp 105b and the second protrusion 107b of the second clamp 105b can extend along a second width of the second clamp 105b.

[0101]The first protrusion 107a and the second protrusion 107b can each define a longitudinal axis, which can be substantially parallel to each other. In examples with the first protrusion 107a and the second protrusion 107b extending along the length of each of the respective clamps 105a, 105b, the longitudinal axes of each of the first protrusion 107a and the second protrusion 107b can be substantially parallel to longitudinal axes of each of the respective clamps 105a, 105b. In examples with the first protrusion 107a and the second protrusion 107b extending along the width of each of the respective clamps 105a, 105b, the longitudinal axes of each of the first protrusion 107a and the second protrusion 107b can be substantially orthogonal or oblique to longitudinal axes of each of the respective clamps 105a, 105b.

[0102]The first protrusion 107a can be positioned on or extending from the rear portion 108a and/or the rear inner portion 109a. For example, the rear portion 108a and/or the rear inner portion 109a can define the first protrusion 107a, e.g., the first protrusion 107a can be defined between the rear surface 108a and the rear inner surface 109a. In this way, the first protrusion 107a may be referred to herein as a rear protrusion. The second protrusion 107b can be positioned or extending from the front portion 108b and/or the front inner portion 109b. For example, the front portion 108b and/or the front inner portion 109b can define the second protrusion 107b, e.g., the second protrusion 107b can be defined between the front surface 108b and the front inner surface 109b. In this way, the second protrusion 107b may be referred to herein as a front protrusion.

[0103]The UCS 100 can include and/or can couple with a rail 1205, such as a rearward facing rail, and/or a firearm, as depicted in FIGS. 15A-B among others. For example, the clamp system 103 can enable or permit the mounting of the UCS 100 to the rail 1205, e.g., via the clamps 105a, 105b.

[0104]FIGS. 12B-E depict various views of a rail adapter 1210. The rail 1205 and/or the firearm can include the rail adapter 1210. For example, the rail adapter 1210 can couple with the rail 1205 and/or the firearm, as depicted in FIG. 12A among others. The rail adapter 1210 can include a rail engagement surface 1215. The rail engagement surface 1215 can couple with or interface with the rail 1205 and/or the firearm. For example, the rail 1205 and/or the firearm can receive the rail engagement surface 1215 of the rail adapter 1210. The rail engagement surface 1215 can be shaped to correspond with at least a portion of the rail 1205 and/or the firearm. For example, the rail engagement surface 1215 can include a shape that is similar to or the same as the portion of the rail 1205 and/or the firearm that receives the rail engagement surface 1215.

[0105]The rail adapter 1210 can include a stock engagement extension 1220. The stock engagement extension 1220 can extend from the rail engagement surface 1215. For example, a first surface of the rail engagement surface 1215 can couple with the rail 1205 and/or the firearm and the stock engagement extension 1220 can extend from or couple with a second surface, e.g., opposite the first surface, of the rail engagement surface 1215. The stock engagement extension 1220 can include or define a groove 1225, such as a first groove 1225 and a second groove 1225, which may be referred to herein as a slot, indentation, or the like. The grooves 1225 can extend along a length of the stock engagement extension 1220. The stock engagement extension 1220 can include side surfaces, e.g., opposite each other. The side surfaces of the stock engagement extension 1220 can define the grooves 1225. For example, a first side surface of the stock engagement extension 1220 can define the first groove 1225, and a second side surface of the stock engagement extension 1220 can define the second groove 1225.

[0106]The stock engagement extension 1220 can include a rung 1230, e.g., a plurality of rungs 1230. The rungs 1230 can be lateral extensions extending from the stock engagement extension 1220. For example, a longitudinal axis of the rungs 1230 can be substantially orthogonal to a longitudinal axis of the stock engagement extension 1220. The rungs 1230 can be spaced along the length of the stock engagement extension 1220. The rungs 1230 can be spaced apart from each other in increments greater than or equal to about 2 millimeters and less than or equal to about 8 millimeters. For example, the rungs 1230 can be spaced in about 5-millimeter increments along the length of the stock engagement extension 1220.

[0107]The rail adapter 1210, e.g., the stock engagement extension 1220, can include or define a slot 1235, e.g., a plurality of slots 1235. The slots 1235 can be defined between the rungs 1230. For example, the widths of the slots 1235 can be about equal to the incremental spacing of the rungs 1230. For example, the width of each slot 1235 can be greater than or equal to about 8 millimeters and less than or equal to about 12 millimeters. For example, the width of each slot 1235 can be about 10 millimeters. In some examples, the widths of the rungs 1230 can be about equal to the widths of the slots 1235. In other examples, the widths of the rungs 1230 can be greater than the widths of the slots 1235 by about 1-5 millimeters or less than the widths of the slots 1235 by about 1-5 millimeters. The widths of the slots 1235 and/or the incremental spacing of the rungs 1230, can be greater than or about equal to a diameter of the fastener 106.

[0108]The clamp system 103 can couple with the rail adapter 1210. For example, the clamps 105a, 105b can removably or permanently couple with the UCS 100 and/or the rail adapter 1210 of the rail 1205. For example, the clamps 105a, 105b can removably attach to the UCS 100 and/or the rail 1205 such that the clamps 105a, 105b are not permanently affixed to the UCS 100 and/or the rail 1205, respectively. For example, the clamps 105a, 105b can selectively attach or clamp to both the UCS 100 and the rail 1205. In this example, the clamps 105a, 105b can thereby couple the UCS 100 and the rail 1205 to each other. The clamps 105a, 105b can couple with rail adapter 1210 at numerous locations on the rail adapter 1210. For example, the clamps 105a, 105b can be mounted along the length of the rail adapter 1210. For example, the first protrusions 107a and/or the second protrusions 107b can be coupled with the respective grooves 1225 of the rail adapter 1210. For example, the rail adapter 1210 and the UCS 100 can be pushed together, e.g., a force can be applied to the rail adapter 1210 and/or the UCS 100, such that end surfaces of the rungs 1230 abut front or distal surfaces of the clamps 105a, 105b. The end surfaces of the rungs 1230 can include or be angled, e.g., angled or slanted from a substantially planar middle portion of the rungs 1230 towards the rail engagement surface 1215. In response to the pressure, e.g., force, applied to the rail adapter 1210 and/or the UCS 100, the rail adapter 1210 can translate towards the proximal end 190 of the UCS 100, e.g., the angled end surfaces of the rungs 1230 can slide from the distal surfaces of the clamps 105a, 105b to and along inner surfaces of the clamps 105a, 105b, until the protrusions 107a, 107b couple with or snap into the respective grooves 1225 of the rail adapter 1210. The fastener 106 can fit between any of the rungs 1230, e.g., the fastener 106 can extend between any of the rungs 1230 and into any of the slots 1235. Since the clamp system 103 can be flipped, the clamp system 103 can enable or permit adjustment in the vertical position of the UCS 100 along the rail 1205 and/or the rail adapter 1210. Thus, the UCS 100 can be mounted in 5-millimeter increments, as opposed to traditional systems that cannot be flipped which only offer 10 millimeter adjustment spacing due to the standard 10 millimeter Picatinny slot spacing. Thus, the structure of the clamp system 103 can enable a stock height adjustment.

[0109]The first protrusion 107a and the second protrusion 107b can each latch onto, interface with, or otherwise couple with components of the UCS 100 and/or the rail 1205 and/or the firearm. For example, the first protrusion 107a and/or the second protrusion 107b can couple with the second housing 114c, e.g., the first protrusions 107a of each of the clamps 105a and/or the second protrusions 107b of each of the clamps 105a can extend into the respective grooves 115a, 115b of the second housing 114c. For example, the first protrusion 107a and/or the second protrusion 107b can couple with the rail adapter 1210, e.g., the first protrusions 107a of each of the clamps 105a and/or the second protrusions 107b of each of the clamps 105a can extend into the respective grooves 1225 of the rail adapter 1210.

[0110]In some examples, the second protrusion 107b can latch onto, interface with, or couple with the rail 1205 and/or the firearm. For example, the first protrusion 107a can latch onto, interface with, or couple with the UCS 100, e.g., can latch onto, interface with, or couple with the housing assembly 114a and/or components thereof, which may be referred to herein as a clamp adapter housing or clamp adapter housing assembly. For example, the first protrusions 107a can latch onto, interface with, or couple with the second housing 114c. For example, the second protrusions 107b can latch onto, interface with, or couple with the grooves 1225 of the stock engagement extension 1220.

[0111]In other examples, e.g., with the clamp system 103 rotated about a longitudinal axis of the fastener 106, the second protrusion 107b can latch onto, interface with, or couple with the UCS 100, e.g., can latch onto, interface with, or couple with the housing assembly 114a and/or components thereof. For example, the first protrusion 107a can latch onto, interface with, or couple with the rail 1205 and/or the firearm. For example, the first protrusions 107a can latch onto, interface with, or couple with the grooves 1225 of the stock engagement extension 1220. For example, the second protrusions 107b can latch onto, interface with, or couple with the second housing 114c.

[0112]The housing assembly 114a and/or components thereof can be formed to receive or interface with the first protrusion 107a and/or the second protrusion 107b. For example, the first protrusion 107a and the second protrusion 107b can include dimensions, such as a length and width, that are substantially equal. The housing assembly 114a and/or components thereof, such as the second housing 114c, can include or define a groove, which may be referred to herein as a slot, indentation, or the like. For example, the housing assembly 114a and/or components thereof, such as the second housing 114c, can include or define a first groove 115a and/or a second groove 115b, as depicted in FIG. 6 among others. The grooves 115a, 115b can be defined at or by an internal surface of the housing assembly 114a and/or components thereof. For example, the grooves 115a, 115b can be hidden or otherwise not visible in an operational orientation of the UCS 100.

[0113]The grooves 115a, 115b can be formed to interface with components of the stock 100, e.g., to receive the first protrusion 107a and/or the second protrusion 107b of each of the respective clamps 105a, 105b. The first protrusion 107a and/or the second protrusion 107b of each of the respective clamps 105a, 105b can be formed to interface with components of the stock 100, e.g., to extend into and/or latch onto the grooves 115a, 115b of the housing assembly 114a. For example, as depicted in FIG. 6 among others, the first groove 115a can receive the first protrusion 107a of the first clamp 105a, e.g., the first protrusion 107a can extend into and/or latch onto the first groove 115a, and the second groove 115b can receive the first protrusion 107a of the second clamp 105b, e.g., the first protrusion 107a can extend into and/or latch onto the second groove 115b.

[0114]The UCS 100 and/or the clamp system 103 can include or be positioned in various orientations, such as a first orientation 1305 (see at least FIGS. 13A, 14A, and 15A) and a second orientation 1310 (see at least FIGS. 13B, 14B, and 15B). For example, the clamp system 103 can flip, reverse, rotate, or the like. For example, the clamp system 103 can be rotated about 180 degrees about the longitudinal axis 127. In other examples, the clamp system 103 can be rotated about 180 degrees about the longitudinal axis of the fastener 106.

[0115]With the clamp system 103 in the first orientation 1305, the first protrusion 107a of the first clamp 105a can couple with the first groove 115a of the housing assembly 114a and/or components thereof, and the first protrusion 107a of the second clamp 105b can couple with the second groove 115b of the housing assembly 114a and/or components thereof (see FIG. 6 among others). The couplings of the first protrusions 107a of the clamps 105a, 105b with the respective grooves 115a, 115b of the housing assembly 114a and/or components thereof can enable or permit locking, mounting, or coupling of the clamps 105a, 105b with the UCS 100. For example, the interface of the first protrusion 107a of the first clamp 105a and the first groove 115a can enable or permit locking, mounting, or coupling of the first clamp 105a to the UCS 100. For example, the interface of the first protrusion 107a of the second clamp 105b and the second groove 115b can enable or permit locking, mounting, or coupling of the second clamp 105b to the UCS 100.

[0116]Similarly, with the clamp system 103 in the first orientation 1305, the second protrusion 107b of the first clamp 105a can couple with the first groove 1225 of the rail adapter 1210, and the second protrusion 107b of the second clamp 105b can couple with the second groove 1225 of the rail adapter 1210 (see FIGS. 13A and 14A). The couplings of the second protrusions 107b of the clamps 105a, 105b with the respective grooves 1225 of the rail adapter 1210 can enable or permit locking, mounting, or coupling of the clamps 105a, 105b, and thus the UCS 100, with the rail 1205 and/or the firearm. For example, the interface of the second protrusion 107b of the first clamp 105a and the first groove 1225 can enable or permit locking, mounting, or coupling of the first clamp 105a to the rail 1205 and/or the firearm. For example, the interface of the second protrusion 107b of the second clamp 105b and the second groove 1225 can enable or permit locking, mounting, or coupling of the second clamp 105b to the rail 1205 and/or the firearm.

[0117]With the clamp system 103 in the second orientation 1310, the first protrusion 107a of the first clamp 105a can couple with the second groove 115b of the housing assembly 114a and/or components thereof, and the first protrusion 107a of the second clamp 105b can couple with the first groove 115a of the housing assembly 114a and/or components thereof. The couplings of the first protrusions 107a of the clamps 105a, 105b with the respective grooves 115a, 115b of the housing assembly 114a and/or components thereof can enable or permit locking, mounting, or coupling of the clamps 105a, 105b with the UCS 100. For example, the interface of the first protrusion 107a of the first clamp 105a and the second groove 115b can enable or permit locking, mounting, or coupling of the first clamp 105a to the UCS 100. For example, the interface of the first protrusion 107a of the second clamp 105b and the first groove 115a can enable or permit locking, mounting, or coupling of the second clamp 105b to the UCS 100.

[0118]With the clamp system 103 in the second orientation 1310, the second protrusion 107b of the first clamp 105a can couple with the second groove 1225 of the rail adapter 1210, and the second protrusion 107b of the second clamp 105b can couple with the first groove 1225 of the rail adapter 1210 (see FIGS. 13B and 14B). The couplings of the second protrusions 107b of the clamps 105a, 105b with the respective grooves 1225 of the rail adapter 1210 can enable or permit locking, mounting, or coupling of the clamps 105a, 105b, and thus the UCS 100, with the rail 1205 and/or the firearm. For example, the interface of the second protrusion 107b of the first clamp 105a and the second groove 1225 can enable or permit locking, mounting, or coupling of the first clamp 105a to the rail 1205 and/or the firearm. For example, the interface of the second protrusion 107b of the second clamp 105b and the first groove 1225 can enable or permit locking, mounting, or coupling of the second clamp 105b to the rail 1205 and/or the firearm.

[0119]The UCS 100 can include a fastener 102a, as depicted in FIGS. 7 and 9A among others. In some examples, the fastener 102a can be a screw, such as a machine screw or the like. In some examples, the fastener 102a can include two or more fasteners or be a fastener system, e.g., including a washer 102b, nut, or the like. The fastener 102a can further enable or permit the coupling of the clamps 105a, 105b and the housing assembly 114a. The fastener 102a can further enable or permit the coupling of the clamps 105a, 105b and/or the housing assembly 114a with the UCS 100. For example, the fastener 102a can extend through a hole 122 defined by the second housing 114c and a hole 124 defined by the female portion 111, thereby coupling the second housing 114c and the female portion 111. The holes 122, 124 can be threaded to interface with the fastener 102a, e.g., the fastener 102a can be threaded as well. In other examples, the fastener 102a can extend through the holes 122, 124 and couple with a nut on an opposite side of the housing assembly 114a.

[0120]The housing assembly 114a and/or components thereof can at least partially cover components of the UCS 100. For example, the housing assembly 114a and/or components thereof can at least partially cover portions of a hinge 110 or hinge assembly 112. For example as depicted in FIGS. 1 and 5 among others, the second housing 114c can at least partially encase or cover a first or female portion 111 of the hinge 110 (which is depicted uncovered in FIG. 4 among others), and the first housing 114b can at least partially encase or cover a second or male portion 113 of the hinge 110 (which is depicted uncovered in FIG. 4 among others). As such, the housing assembly 114a and/or components thereof may cover at least portions of the hinge 110 such that the male portion 113 and the female portion 111 are substantially not visible.

[0121]The housing assembly 114a and/or components thereof can couple with the hinge 110 and/or components thereof. For example, the second housing 114c can couple with the female portion 111 of the hinge 110 and/or the first housing 114b can couple with the male portion 113 of the hinge 110. In these examples, the housing assembly 114a and/or components thereof, such as the second housing 114c, can enable or provide a connection between the clamps 105a, 105b and the hinge 110, and the housing assembly 114a and/or components thereof, such as the first housing 114b, can enable or provide a connection between the upper stock body 104b and the hinge 110.

[0122]The UCS 100 can include a fastener 106, as depicted in FIGS. 1, 6, 8, and 9A among others. In some examples, the fastener 106 can be a screw, such as a machine screw or the like. In some examples, the fastener 106 can include two or more fasteners. In this example, spacing of the fasteners can coincide with the cross slot spacing of the rail 1205.

[0123]The fastener 106 can further enable or permit the coupling of the clamps 105a, 105b with the rail 1205 and/or the UCS 100. The fastener 106 can secure to each of the clamps 105a, 105b. For example, the fastener 106 can secure the clamps 105a, 105b to each other, e.g., the clamps 105a, 105b can be held together or in place by the fastener 106. In these example, the clamps 105a, 105b can be secured to each other or held together and not contact each other, e.g., the clamps 105a, 105b can be secured in place such that movement between the clamps 105a, 105b is inhibited. For example, the clamps 105a, 105b can be tightened around the rail 1205 and/or the UCS 100 via a fastener 106. The fastener 106 can extend through or into each of the respective holes 117 of the clamps 105a, 105b. The outer surface of the fastener 106 and the clamp surface defining the holes 117 can be structured to interface, e.g., couple together. For example, in embodiments where the fastener 106 is a screw, the holes 117 can be threaded. With the clamps 105a, 105b coupled with the UCS 100, the fastener 106 can reside within or near the receiver interface area 104d.

[0124]With the UCS 100 mounted to the rail 1205 and/or the firearm, the fastener 106 can reside within the slots 1235 of the rail adapter 1210 and can hold or secure the UCS 100 in a substantially vertical position, e.g., in addition to the clamps 105a, 105b, which can be tightened via the fastener 106 onto the rail adapter 1210. The combination of lateral pressure from the clamps 105a, 105b on the outside of the rail adapter 1210, and the fastener 106 passing between the rungs 1230, can provide a sturdy or removably fixed connection between the UCS 100 and the rail 1205 and/or the firearm. This sturdy or removably fixed connection enabled by at least the clamp system 103 and/or the fastener 106 can prevent or inhibit movement of the UCS 100 with respect to the rail 1205 and/or the firearm, and thus can enable a reduction in shifting, vibration, or rattling of the UCS 100, e.g., with respect to traditional systems.

[0125]One downside of affixing stocks to a rail 1205 with a fastener passing through valleys in the rail is that granularity of vertical adjustment of the stock is limited by the valley spacing (e.g., 5.25 mm between adjacent studs or ridges). Typically, a stock mounted to a rail on a receiver can move up or down in increments corresponding to the distance between cross slots (e.g., 10 mm with a Picatinny rail).

[0126]To provide smaller increments of vertical movement, and thus an increase in stock height adjustability, the fastener 106 can be vertically offset from a center of the UCS 100 (or the stock-to-rail interface), e.g., from a center point of the middle portion 108c. For example, since the holes 117 can be defined offset from a center point of the clamps 105a, 105b and/or the center point of the middle portion 108c of each of the clamps 105a, 105b, e.g., by greater than or equal to about Imm and less than or equal to about 19 mm, e.g., about 5 mm, the fastener 106 can interface with or extend through the clamps 105a, 105b at this offset as well.

[0127]In this way, a first set of vertical positions is possible with the UCS 100 or stock-to-rail interface, e.g., the clamp system 103, arranged in the first orientation 1305, and by flipping the UCS 100 or stock-to-rail interface, e.g., the clamp system 103, (e.g., rotating about 180 degrees, such as rotating the clamp system 103 180 degrees about the longitudinal axis of the fastener 106 or rotating the clamp system 103 180 degrees about the longitudinal axis 127) to the second orientation 1310, a second set of vertical positions is possible that are offset from the first set. In essence, greater granularity of vertical adjustment is provided by the structure of the clamp system 103, which can include the fastener 106. For instance, with a 10 millimeters rail cross slot spacing, e.g., with the widths of the slots 1235 about 10 millimeters, the fastener 106 can be offset about 5 millimeters from a vertical center of the stock 100 or stock-to-rail interface, e.g., the clamps 105a, 105b, and the stock 100 can be adjusted vertically in increments of about 5 millimeters rather than the 10 millimeters set by the rail cross slot spacing. Beyond improving user fit, this also allows better optimization and adaptation to different weapon platforms where vertical constraints can exist on both the top (e.g., ejection port and/or charging handle clearance) and the bottom (e.g., trigger, magazine release, safety, bolt release). For example, the clamp system 103 can enable or permit fine tuning of the height of the stock 100, e.g., relative to the sight plane of sights or optics mounted to or coupled with the firearm.

Rotational Folding Direction Features of the UCS 100

[0128]As depicted in FIGS. 1 and 7-11B among others, the UCS 100 can include or can couple with a hinge 110 and/or with a hinge assembly 112. The hinge assembly 112 can include the hinge 110, the housing assembly 114a and/or components thereof, the clamps 105a, 105b, and/or the clamp system 103, as depicted in FIG. 8 among others. In these embodiments, the UCS 100 and the hinge 110 can be referred to herein as the stock system and/or the UCS 100 and the hinge assembly 112 can be referred to herein as the stock system.

[0129]In some embodiments, the UCS 100 can fold, e.g., reversibly fold. In this way, the stock 100 may be referred to herein as a reversible folding stock, a folding rifle stock, or the like. The hinge 110 and/or the hinge assembly 112 can permit or enable folding of the UCS 100, e.g., reversible folding. The hinge 110 and/or the hinge assembly 112 can be reversible and can be referred to herein as a reversible hinge 110 and a reversible hinge assembly 112, respectively. For example, the hinge 110 and/or hinge assembly 112 can be removed and rotated, which can flip the rotation of the hinge 110, e.g., from one side to the other, thereby allowing reversible folding. Reversible folding can permit or enable users whom are right-handed and/or left-handed to operate the UCS 100. Additionally, reversible folding can permit or enable additional user preference options, ease-of-deployment functionality, and/or additional storage options, as compared to traditional stocks, regardless of a user's handedness.

[0130]The UCS 100 and/or the hinge assembly 112 can include or be positioned in various orientations, such as a first orientation 1605 (see at least FIGS. 16A, 17A, 18A, 19A, and 19B) and a second orientation 1610 (see at least FIGS. 16B, 17B, 18B, 20A, and 20B). For example, the hinge assembly 112 can flip, reverse, rotate, or the like. For example, the hinge assembly 112 can be rotated about 180 degrees about the longitudinal axis 127. The UCS 100 and/or the hinge assembly 112 can include or be positioned in various positions, such as a first, closed, or deployed state or position 1805 (see at least FIGS. 18A-B), and a second, open, stowed, or folded state or position 1905 (see at least FIGS. 11A-B and 19A-20B).

[0131]The hinge assembly 112 and/or the housing assembly 114a can couple with the UCS 100, e.g., the upper stock body 104b. The UCS 100 can include a LOP rail 130, as depicted in FIGS. 5-9A among others. The LOP rail 130 can couple with the hinge assembly 112 and/or the housing assembly 114a and/or components thereof, such as the first housing 114b. The UCS 100 can include a standing gusseted tab 120a. For example, the hinge assembly 112, e.g., the male portion 113, can include the standing gusseted tab 120a, as depicted in FIGS. 7, 8, and 16A-B among others. The standing gusseted tab 120a can include or define a longitudinal axis 120c. The longitudinal axis 120c of the standing gusseted tab 120a can be substantially parallel to the longitudinal axis 127 of the upper stock body 104b. In some examples, the longitudinal axis 120c of the standing gusseted tab 120a can be substantially parallel and aligned with the longitudinal axis 127 of the upper stock body 104b. For example, the longitudinal axis 120c of the standing gusseted tab 120a can be substantially the same as the longitudinal axis 127 of the upper stock body 104b. However, in other embodiments, the longitudinal axis 127 can be other than parallel to the longitudinal axis 120c of the upper stock body 104b, for instance between 0 to 5 degrees from parallel. The standing gusseted tab 120a can define a hole 120b. The hole 120b can extend through a thickness of the standing gusseted tab 120a, e.g., an entire thickness such that the hole 120b can be referred to herein as a through hole.

[0132]The LOP rail 130 can define a slot 125, as depicted in FIG. 7 among others. The first housing 114b can be shaped to correspond with the shape of the slot 125. In this way, the first housing 114b can define the slot 125. The slot 125 can extend through a thickness of the LOP rail 130. For example, the slot 125 can extend through a thickness of the LOP rail 130 that is sufficient to receive the standing gusseted tab 120a and/or the hole 120b of the standing gusseted tab 120a. For example, the slot 125 can extend through a thickness of the LOP rail 130 that is about equal to the length of the standing gusseted tab 120a and/or the diameter of the hole 120b of the standing gusseted tab 120a. The LOP rail 130 can define a pocket or an aperture 133, as depicted in FIG. 9A among others. The LOP rail 130 can define the aperture 133 on a side surface of the LOP rail 130. For example, the aperture 133 can extend through a thickness of the LOP rail 130, such as from a first side to a second side of the LOP rail 130, e.g., through an entire thickness of the LOP rail 130.

[0133]The standing gusseted tab 120a can couple or interface with the slot 125. For example, the standing gusseted tab 120a can insert or be inserted into the slot 125. The UCS 100 can include an extension fastener 116, such as a screw, and a nut 121, e.g., configured to couple with the fastener 116. The fastener 116 can pass through the aperture 133 of the LOP rail 130, e.g., on a first side surface of the LOP rail 130; the hole 120b in the standing gusseted tab 120a, e.g., with the standing gusseted tab 120a inserted into the slot 125 of the LOP rail 130; through the aperture 133 of the LOP rail 130, e.g., on a second side surface of the LOP rail 130 opposite the first side surface of the LOP rail 130; and into the nut 121. For example, the standing gusseted tab 120a can be coupled with or sandwiched in the LOP rail 130. For example, as depicted in FIG. 9A among others, the fastener 116 can pass through the LOP rail 130 and the gusseted tab 120a of the hinge assembly 112 to couple the hinge assembly 112 to the LOP rail 130

[0134]The fold direction of the UCS 100 can be flipped, reversed, rotated, and the like. For example, the fastener 116 can be released or otherwise unscrewed, e.g., from the nut 121. The housing assembly 114a and the UCS 100 can uncouple. For example, the hinge 110 and/or hinge assembly 112 can be uncoupled from the UCS 100, e.g., the standing gusseted tab 120a can be pulled out of the slot 125. The hinge 110 and/or hinge assembly 112 can be flipped or reversed. For example, the hinge 110 and/or hinge assembly 112 can be rotated about the longitudinal axis 120c of the standing gusseted tab 120a, e.g., rotated 180 degrees. The standing gusseted tab 120a can couple or re-couple with the UCS 100. For example, the standing gusseted tab 120a can be re-inserted into the slot 125. The hinge 110 and/or hinge assembly 112 can be secured to the UCS 100, e.g., the fastener 116 can be fastened, tightened, or coupled with the nut 121. In this way, the hinge 110 and/or hinge assembly 112 can couple with UCS 100, e.g., the upper stock body 104b, in the first orientation 1605 (see at least FIGS. 16A, 17A, 18A, 19A, and 19B) and in the second orientation 1610 (see at least FIGS. 16B, 17B, 18B, 20A, and 20B). For example, the second orientation 1610 of the hinge 110 and/or hinge assembly 112 can include a 180 degree rotation of the hinge 110 and/or hinge assembly 112 from the first orientation 1605. For example, the first orientation 1605 of the hinge 110 and/or hinge assembly 112 can include a 180 degree rotation of the hinge 110 and/or hinge assembly 112 from the second orientation 1610. The UCS 100 can be structured such that the clamps 105a, 105b can remain coupled with the housing assembly 114a during the rotation of the hinge 110 and/or hinge assembly 112.

[0135]The hinge 110 can include a first half or portion, such as a female half or portion 111, and a second half or portion, such as a male half or portion 113, as depicted in FIG. 7 among others. The male and female portions 111, 113 can be structured to mate, e.g., interface, with one another. The male and female portions 111, 113 can rotate around a hinge pin 152. The hinge pin 152 can define a pivot axis 126, as depicted in FIG. 10 among others. For example, at least one of the female portion 111 or the male portion 113 can rotate around or about the pivot axis 126 of the hinge 110, e.g., defined by the hinge pin 152.

[0136]The UCS 100 can include a hinge button 140. The hinge button 140 can permit or enable a release of the hinge 110 from the deployed position 1805. For example, the hinge button 140 can permit or enable folding of the UCS 100, e.g., from the deployed position 1805 to the folded position 1905.

[0137]The hinge button 140 can include a latching structure 146, as depicted in FIGS. 6 and 9A among others. The hinge button 140 can be coupled with the male portion 113 and/or the housing assembly 114a. For example, a portion of the hinge button 140 can be at least partially housed within the male portion 113 of the hinge assembly 112 and/or the hinge button 140 can extend from the male portion 113. Additionally, the housing assembly 114a and/or the clamp system 103 can include a mating latching structure 148. For example, the female portion 111 can include the latching structure 148. Interaction between the hinge button 140 and the female portion 111 can lock the hinge assembly 112 and hold the UCS 100 in the deployed position 1805. The latching structures 146, 148 can interface with each other or removably couple with each other. For example, the latching structures 146, 148 can be structured to interface or interact with each other. For example, the latching structure 146 can be ramped or include a ramped surface or portion that can interact with a surface or portion of the mating latching structure 148. For example, mating latching structures 148 can include a can be ramped or include a ramped surface or portion that is similar to or the same as the latching structure 146. The latching structures 146, 148 can each include a substantially flat side or surface that interface or contact each other. For example, the latching structures 146, 148 can couple with each other or hook together at the respective substantially flat surfaces, e.g., in the deployed position 1805 of the UCS 100 or hinge assembly 112.

[0138]The UCS 100 can include a spring 1452. The spring 1452 can be housed within the male portion 113 of the hinge assembly 112, as depicted in FIG. 9A among others. The spring 1452 can be positioned substantially orthogonal to the longitudinal axis 127 of the upper stock body 104b. For example, the spring 1452 can define a longitudinal axis substantially orthogonal to the longitudinal axis 127 of the upper stock body 104b. The hinge button 140 can be biased away from the upper stock body 104b by the spring 1452. In this example, the hinge button 140 can be referred to herein as a biased hinge button.

[0139]The hinge button 140 can be activated, e.g., the spring 1452 can be depressed via a force applied to the hinge button 140. The UCS 100 can be transitioned from the deployed position 1805 to the stowed position 1905, e.g., folded, in response to the activation of the hinge button 140. For example, the force applied to the hinge button 140 can be in a direction substantially orthogonal to the longitudinal axis of the upper stock body 104b and/or substantially parallel to the longitudinal axis of the spring 1452.

[0140]The activation of the hinge button 140, e.g., the depression of the spring 1452, can permit or enable the flats of the latching structures 146, 148 to separate. For example, the latching structure 146 can translate or move in a direction substantially orthogonal to the longitudinal axis 127 of the upper stock body 104b while the latching structure 148 can remain stationary, e.g., with respect to the UCS 100. Since the latching structure 146 travels away from the latching structure 148, the latching structures 146, 148 can uncouple or unhook and clear each other. The uncoupling of the latching structures 146, 148 can enable or permit the female portion 111 and the male portion 113 of the hinge 110 to separate, e.g., rotate apart. For example, the female portion 111 can swing open and away from the male portion 113, e.g., about the pivot axis 126 defined by the hinge pin 152. Additionally, the second housing 114c can swing open and away from the first housing 114b, e.g., about the pivot axis 126.

[0141]To deploy the UCS 100, e.g. from the folded position 1905 to the deployed position 1805, the female and male portions 111, 113 can couple together. For example, the female portion 111 can swing closed toward the male portion 113, e.g., about the pivot axis 126 defined by the hinge pin 152. Additionally, the second housing 114c can closed toward the first housing 114b, e.g., about the pivot axis 126. The ramped portions of the latching structures 146, 148 can be coupled together, e.g., such that the latching structures 146, 148 hook together. For example, the latching structures 146, 148 can meet, at which point additional torque on the hinge assembly 112 causes a camming action that back drives or depresses the hinge button 140 against the bias of the spring 1452 until the latching structures 146, 148 clear each other and re-hook. The latching structure 146 can return to a relaxed position with the flats of the latching structures 146, 148 facing each other and inhibiting the UCS 100 from folding, e.g., inhibiting the hinge assembly 112 from opening, until the hinge button 140 is sufficiently depressed. In these examples, the UCS 100 can be structured such that the hinge assembly 112 can be closed, which can coincide with the deployment of the UCS 100, in the absence of activation of the hinge button 140, e.g., without user interaction with the hinge button 140. Further, the UCS 100 can be structured such that the hinge assembly 112 can be opened, which can coincide with stowing of the UCS 100 in the folded position 1905, upon activation of the hinge button 140, e.g., with user interaction with the hinge button 140.

[0142]The hinge 110 can be arranged at an angle relative to the upper stock body 104b, e.g., at about a 0 to 5 degree drop angle. For example, the angle can be greater than or equal to about 2 degrees and less than or equal to about 8 degrees. In this example, the longitudinal axis 120c of the standing gusseted tab 120a can be oblique to the longitudinal axis 127 of the upper stock body 104b. With the hinge 110 at an angle and with the UCS 100 in the stowed position 1905, e.g., folded, a top of the upper stock body 104b is angled below at least an operating surface, a control surface, components of the receiver, such as the bolt and ejection port, and/or the like. With this configuration, the firearm can be operated with the UCS 100 in the folded position 1905, e.g., with the UCS 100 not yet in the deployed position 1805.

[0143]The UCS 100 can include a bushing 150, such as a first bushing and a second bushing. The bushings 150 can couple with the hinge pin 152. For example, the bushings 150 can surround a circumference of the hinge pin 152. The bushings 150 can translate along the length of the hinge pin 152. In this way, the bushings 150 can slidably couple with the hinge pin 152. The UCS 100 can include a spring 156. The spring 156 can couple with the binge pin 152. For example, the spring 156 can surround the circumference of the hinge pin 152. In some examples, the spring 156 can be positioned between the bushings 150, e.g., the spring 156 can be positioned between the first bushing and the second bushing. In this example, the spring 156 can bias the bushings 150 away from each other, e.g., towards respective ends of the hinge pin 152. In other examples, such as examples with only a first bushing, the spring 156 can be positioned between the first bushing and another component of the UCS 100, such as the female portion 111 or the male portion 113. In this example, the spring 156 can bias the first bushing towards a respective end of the hinge pin 152.

[0144]The bushings 150 can each include a detent or protrusion 153, e.g., the bushings 150 can each include a plurality of detents 153 spaced around a circumference of the respective bushing 150. For example, the detents 153 can extend vertically from a top surface of the bushing 150, as depicted in FIG. 9A among others. In other examples, the detent 153 can extend laterally from a side surface of the bushing 150. The detent 153 can be structured or shaped to interface with other components of the UCS 100.

[0145]The UCS 100 can include a clevis 154, such as a first clevis and a second clevis. For example, the female portion 111 can include the clevises 154, as depicted in FIG. 9A among others. The clevises 154 can extend from a first portion, such as a lower end, of the female portion 111 and/or from a second portion, such as an upper end, of the female portion 111. The clevises 154 can include or define a tapered slot or cutout 118, e.g., a plurality of cutouts 118. The cutouts 118 can be spaced around a circumference of clevis 154.

[0146]The clevis 154 can receive the hinge pin 152. In some examples, a hole or indentation defined by the clevis 154 can receive the hinge pin 152. For example, the first clevis, e.g., a hold defined by the first clevis, can receive a first portion or end of the hinge pin 152 and the second clevis, e.g., a hold defined by the second clevis, can receive a second portion or end of the hinge pin 152. In this way, the bushings 150 can be positioned between the clevises 154. For example, the first bushing and the second bushing can slidably couple with the hinge pin 152 between the first clevis and the second clevis. Additionally, the spring 156 can be positioned between the clevises 154, such as the first clevis and the second clevis.

[0147]The bushing 150 can interface with the clevis 154, e.g., each bushing 150 can interface with a respective clevis 154 and each clevis 154 can interface with a respective bushing 150. For example, the detent 153 can interface with the cutout 118, e.g., each detent 153 can interface with a respective cutout 118 and each cutout 118 can interface with a respective detent 153. The bushing 150 can be structured or shaped to interface with the clevis 154 and/or the clevis 154 can be structured or shaped to interface with the bushing 150. For example, the detent 153 can be structured or shaped to interface with the cutout 118 and/or the cutout 118 can be structured or shaped to interface with the detent 153. For example, the detent 153 can include a shape, such as a truncated triangle, semi-circle, or rectangle, and the cutout 118 can define a respective shape that aligns with or receives the shape of the detent 153, such as a truncated triangle, semi-circle, or rectangle, respectively. In these examples, the bushings 150 can include the same number of detents 153 as the number of cutouts 118 defined by the clevises 154.

[0148]As discussed herein, the female portion 111 can rotate around the hinge pin 152 in response to activation of the hinge button 140. Since the female portion 111 can include the clevises 154, e.g., since the clevises 154 extend from the female portion 111, the clevises 154 can rotate around the hinge pin 152 in response to activation of the hinge button 140. As the clevises 154 rotate, the detents 153 of the bushings 150 can slip out of the respective cutouts 118 of the clevises 154 For example, the rotation of the clevises 154 can permit or enable vertical translation of the bushings 150. For example, the thicker or longer portions of the clevises 154, e.g., adjacent to or otherwise surrounding the cutout 118, can force the detent 153 of the bushing 150 down and completely out of the respective cutout 118. For example, the bushings 150 can be forced towards the center of the 152, e.g., towards each other, in response to the rotation of the female portion 111 and thus rotation of the clevises 154.

[0149]The bushing 150 can include an extension, such as a key extension 119, e.g., each bushing 150 can include a respective key extension 119. The male portion 113 can define a groove, such as a key groove 123. The key groove 123 can be a plurality of grooves, e.g., defined at different portions of the male portion 113, or a single groove extending along a length of a portion of the male portion 113. The key extension 119 and the key groove 123 can interface with each other. For example, the bushings 150 can be keyed into the male portion 113, e.g., the bushings 150 and the male portion 113 can have a keyed connection or coupling via the key extension 119 of the bushings 150 and the key groove 123 of the male portion 113.

[0150]This keyed connection between the bushings 150 and the male portion 113 can inhibit or prevent the bushings 150 from rotating, e.g., about the hinge pin 152 during rotation of the female portion 111 and the clevises 154. This keyed connection between the bushings 150 and the male portion 113 can permit or enable the bushings 150 to move or translate up and/or down, e.g., along the length of the hinge pin 152 and/or within the key groove 123 of the male portion 113. For example, the bushings 150 can move or translate up and/or down in response to a biasing force, e.g., exerted by the spring 156 and/or respective clevises 154. For example, the spring 156 can push bushings 150 away from each other and the clevises 154 can push the bushings 150 toward each other. In this way, the bushings 150 can slide vertically along the hinge pin 152.

[0151]For example, the bushings 150 can be spring biased in opposing directions into engagement with the clevises 154, e.g., at the top and bottom of the hinge 110. The spring 156 can be aligned along the pivot axis 126 of the hinge 110 and can have a spring force selected to allow the hinge assembly 112 to be rotated open and closed, e.g., via a reasonable user effort, with the spring force partially dictating the user force needed to open and close the hinge assembly 112, as depicted in FIG. 10 among others. Although the spring 156 is depicted in FIG. 10 among others, other embodiments can include other biasing devices to bias the bushings 150 into the clevises 154, such as leaf springs, compressible materials like a rubber bushing, spring and damper systems, and the like.

[0152]For the purposes of this disclosure, the term “detent” may be used to describe parts that function to hold components in a particular place, because a detent is known in the art to be a simple mechanism that utilizes locking components to hold other components in place relative to each other. It is also contemplated that the detents or other locking members described herein can have different geometrical shapes, such as oval, triangular, square, or the like. Additionally, other locking elements of the disclosure can vary greatly in size, in order to be suitable for a variety of mechanical locking applications.

[0153]In some embodiments of this disclosure, aspects of the hinge assembly 112 can comprise polymers, metals, ceramics or a combination of two or more of these. For instance, ceramic coatings on polymer or metal components can be used in some embodiments. Other embodiments can be formed from a combination of polymers and other materials, metals and other materials, polymers and metals, or polymers, metals, and other materials.

[0154]In many embodiments, to deploy the UCS 100 from the folded position 1905, a user can rotate the UCS 100 towards the deployed position from folded with no further manipulation necessary, though sufficient torque is used to overcome the spring bias from the spring 156 and angled interfacing of the bushings 150 and the clevises 154. For example, in such embodiments, the bushings 150 can be compressed toward each other and against the force of the spring 156 as the tapered/angled faces of the bushings 150 ride up and pass/clear the tapered/angled faces of the clevises 154, which permit rotation of the UCS 100 from the folded position 1905 toward the deployed position 1805. In contrast, this same force along with depression of the hinge button 140 can be used to release the UCS 100 from the deployed position 1805. In either case, once the bushings 150 and clevises 154 are decoupled, the UCS 100 can be manually rotated to the opposing state, such as the deployed position 1805 or folded position 1905. For example, the male and female portions 113, 111 lock into either the deployed position 1805 or the folded position 1905 with the stock folded/stowed or deployed, respectively, these states can be separated by approximately 180°. For example, the opposing portions of the hinge snap fit into two positions roughly 180° apart.

LOP Adjustment Features of the UCS 100

[0155]As depicted in FIGS. 1-3 and 5 among others, the UCS 100 can include or can couple with a paddle button, such as a first paddle button 160a and a second paddle button 160b. In these examples, the UCS 100 and either of the buttons 160a, 160b can be referred to herein as the stock system. The UCS 100 can be structured to include only the first paddle button 160a or only the second paddle button 160b. However, including the buttons 160a, 160b on either side of the upper stock body 104b, as depicted in FIGS. 1 and 5 among others, can provide a user with increased adjustability and ease of use. The paddle buttons 160a, 160b can be located toward the rear of the UCS 100, e.g., toward the proximal end 190 of the UCS 100. The paddle buttons 160a, 160b can located at the lower stock body 104a, as depicted in FIGS. 1 and 3 among others, and/or at the upper stock body 104b. For example, the first paddle button 160a can be positioned on a first side of the lower stock body 104a and the second paddle button 160b can be positioned on a second side of the lower stock body 104a opposite than the first side.

[0156]The paddle buttons 160a, 160b can be actuated. For example, the paddle buttons 160a, 160b can each include a button surface 162 and a user can contact or push the button surface 162. The actuation of the paddle buttons 160a, 160b can permit or enable LOP adjustments of the UCS 100. During actuation of the paddle buttons 160a, 160b, a user can adjust the LOP of the UCS 100. When the LOP is at the desired position, the user can release the paddle buttons 160a, 160b, which can thereby return the paddle buttons 160a, 160b to default positions and lock the LOP position of the UCS 100 via an internal rail system, as depicted in FIGS. 2 and 5 among others.

[0157]The UCS 100 can include a compression spring 174. In some examples, the compression spring 174 can be positioned between the first paddle button 160a and the second paddle button 160b. In these examples, the compression spring 174 can bias the first paddle button 160a and the second paddle button 160b away from each other. In other examples, the compression spring 174 can be positioned between an inner surface of the lower stock body 104a and the first paddle button 160a and/or the second paddle button 160b. In these examples, the compression spring 174 can bias the first paddle button 160a and/or the second paddle button 160b away from the inner surface of the lower stock body 104a. Actuation of the first paddle button 160a and/or the second paddle button 160b can include depression of the compression spring 174, which can rotate a pawl 166 outward such that the pawl 166 disengages the aperture 133 of the LOP rail 130. In embodiments including the first paddle button 160a and the second paddle button 160b, the UCS 100 can be structured such that LOP adjustments can only be enabled upon actuation of both of the paddle buttons 160a, 160b. In these examples, accidental adjustments can be inhibited, prevented, limited, or decreased, e.g., with respect to a stock structured such that LOP adjustments can be enabled upon actuation of a single paddle button.

[0158]The UCS 100 can include a LOP locking assembly 161. The UCS 100 and/or the LOP locking assembly 161 can include the first paddle button 160a and/or the second paddle button 160b, the button surface 162, the compression spring 174, a connecting rod 164, and the pawl 166.

[0159]The paddle button 160a and/or the second paddle button 160b can each couple with a respective connecting rod 164. The connecting rod 164 can be coupled with the pawl 166. In this way, the pawl and the paddle button can be rotationally coupled. The connecting rod 164 can include a first, e.g., distal, portion connecting rod extension 163 and a second, e.g., proximal, portion connecting rod extension 165. The UCS 100 can include or define a rear body, e.g., proximal end, insert 168 and/or a front body, e.g., distal end, insert 170. The proximal portion connecting rod extension 165 can be coupled with, e.g., rotatably housed within, the rear body insert 168. The distal portion connecting rod extension 163 can be coupled with, e.g., rotatably housed within, the front body insert 170.

[0160]The UCS 100 can include a support feature 172. The support feature 172 can be positioned behind each pawl 166, e.g., the support features 172 can be closer to the proximal end 190 of the UCS 100 than the pawls 166. Each connecting rod 164 can be supported by a support feature 172. The spring force from the compression spring 174, e.g., applied to the first paddle button 160a and/or the second paddle button 160b, can result in a torque applied to each of the connecting rods 164, which can in turn rotate the pawls 166 inward. The inward rotation of the pawls 166 can enable or permit engagement of the pawls 166 with any of the apertures 133 of the LOP rail 130. Engagement of the pawls 166 with the aperture 133, e.g., the pockets, can enable or permit securement of the LOP adjustment, e.g., in a desired location.

[0161]For example, the first paddle button 160a and/or the second paddle button 160b can be actuated, e.g., the compression spring 174 can be depressed; during depression of the compression spring 174, the UCS 100, e.g., the upper stock body 104b, can be adjusted to a desired LOP; the first paddle button 160a and/or the second paddle button 160b can be deactivated or released and the compression spring 174 can bias the first paddle button 160a and/or the second paddle button 160b outward, thus applying the torque to the respective pawls 166; the pawls 166 can, in response to the torque, engage with a respective aperture 133 of the LOP rail 130 and thus lock the UCS 100 at the desired LOP adjustment. In embodiments with only one of the first paddle button 160a or the second paddle button 160b, the single button 160a or 160b can be held in the depressed state to enable the LOP adjustment. When the LOP is at the desired position, the single button 160a or 160b can be released and the LOP of UCS 100 can be locked in place.

[0162]In some embodiments, the LOP locking assembly 161 can be molded as a single polymer part or other singular component, while in other embodiments, one or more components can be coupled to form the LOP locking assembly 161.

[0163]In some embodiments, the UCS 100 can include an overtravel stop, as depicted in at least FIG. 2. The overtravel stop can be built into the LOP rail 130. The overtravel stop can prevent or inhibit a LOP adjustment extending past a certain distance. In some embodiments, the LOP rail 130 can include a spring pin, which can be arranged in a hole in the LOP rail 130. The spring pin can contact a flat face molded into the UCS 100 as the upper stock body 104b is pulled to its longest position. The contact between spring pin and the flat face can prevent the upper stock body 104b from being pulled too far rearward or forward, e.g., can prevent the upper stock body 104b from being separated from the LOP rail 130.

[0164]In some embodiments, as depicted in FIGS. 24-26 among others, a stock 300, such as MOE Carbine Stock, can include a lock pin 225. The stock 300 can be similar to or the same as the UCS 100 and thus can include features that are similar to or the same as the features of the UCS 100 described and discussed herein.

[0165]LOP adjustments of the stock 300 can be permitted or enabled by the lock pin 225. The lock pin 225 can translate vertically, e.g., in a direction substantially orthogonal to the longitudinal axis 127 of the stock 300. In this way, the lock pin 225 can be referred to herein as a vertically translating lock pin. The lock pin 225 can include one or more horizontal pins, such as a first horizontal pin 230 and a second horizontal pin 232. The horizontal pins 230, 232 can extend through the lock pin 225. Longitudinal axes of the horizontal pins 230, 232 can be substantially orthogonal to a longitudinal axis of the lock pin 225. The lock pin 225 can include a spring 222. The spring 222 can bias the lock pin 225 toward the UCS 100, e.g., the upper stock body 104b.

[0166]The LOP rail 130 can include or define under-pockets 228, as depicted in FIG. 26 among others. The under-pockets 228 can be located on an underside of the LOP rail 130. The lock pin 225 can interface with under-pockets 228. For example the under-pockets 228 can receive the lock pin 225. In this way, the lock pin 225 and/or the under-pockets 228 can be shaped to interface with each other. The spring 222 can bias the lock pin 225 into the under-pockets 228.

[0167]The stock 300 can include a lever 220. The lever 220 can include a first end 235, a second end 236, and a middle portion 237 between the first end 235 and the second end 236. The lever 220 can couple with the stock 300 and/or the LOP rail 130, e.g., at the middle portion 237. The lever 220 can contact the lock pin 225, e.g., the first horizontal pin 230, at the first end 235 of the lever 220.

[0168]The lever 220 can be operated or actuated, e.g., by a user. The actuation of the lever 220 can enable, permit, or control movement, e.g., vertical movement, of the lock pin 225. For example, lever 220 can be depressed, e.g., at the second end 236. For example, the second end 236 can translate or move toward the upper stock body 104b and/or the LOP rail 130. In response to the depression of the second end 236, the first end 235 can translate or move away from the upper stock body 104b and/or the LOP rail 130 Upon this movement of the first end 235, the first end 235 can translate or move the lock pin 225 down or away from the upper stock body 104b and/or the LOP rail 130, e.g., due to the contact between the first horizontal pin 230 and the first end 235. With the lock pin 225 moved down or away from the upper stock body 104b and/or the LOP rail 130, the lock pin 225 can disengage or uncouple from the under-pocket 228 of the LOP rail 130 and the LOP can be adjusted. Upon release of the lever 220, the spring 222 can bias the lock pin 225 up again toward the upper stock body 104b and/or the LOP rail 130, and the lock pin 225 can be received by an under-pocket 228, thus locking the lock pin 225 in the respective under-pocket 228 and securing the LOP adjustment at the desired length. As such, the UCS 100 can operate with multiple stock styles including other AR-compatible stocks with different functionality to those described herein, such as the Magpul CTR, ACS, STR, MOE SL, MOE TR, MOE Carbine Stock (see FIGS. 24-26), and the like.

Sling Mount Position Adjustment Features of the UCS 100

[0169]As depicted in FIG. 9B among others, the UCS 100 can include or can couple with a sling mount assembly or a sling mount 195, such as a quick disconnect (QD) sling mount. In these embodiments, the UCS 100 and the sling mount 195 can be referred to herein as the stock system. The sling mount 195 can be located toward the rear of the UCS 100, e.g., toward the proximal end 190 of the UCS 100. The sling mount 195 can include a cup 192, a plug 194, and a fastener 193. The cup 192 can be located on a first side of the upper stock body 104b and the plug 194 can be located on a second side of the upper stock body 104b opposite the first side.

[0170]The UCS 100, e.g., the upper stock body 104b, can define a hole 197. The hole 197 can extend through a thickness of the UCS 100, e.g., the upper stock body 104b. For example, the hole 197 can extend between and through the first side and the second side of the upper stock body 104b. The fastener 193 can extend through the hole 197 and couple with the cup 192 and the plug 194, thereby coupling the cup 192 and the plug 194 together. For example, the fastener 193 is installed through the plug 194 and threaded into the cup 192 on the opposing side. The cup 192 and the plug 194, e.g., portions of the cup 192 and the plug 194, can extend through or into the hole 197.

[0171]The sling mount 195 can be reversed and thus can be referred to herein as a reversible sling mount. For example, a user can select which side of the UCS 100 sling mount 195 is accessible, e.g., which side a sling can be mounted to. For example, the location of the sling mount 195 can be based on the orientation of the hinge assembly 112, e.g., and can remain accessible with the UCS 100 in the folded or stowed stated.

[0172]In some embodiments, the sling mount 195 components can increase the structural integrity of the UCS 100, e.g., when installed. For example, during assembly of the UCS 100, the first paddle button 160a and/or the second paddle button 160b, the rods 164, and the pawls 166 can be installed prior to installation of the proximal end insert 168, e.g., to capture the rear rod extensions 165, which can hold or secure the first paddle button 160a and/or the second paddle button 160b in place.

[0173]The proximal end insert 168 can also hold or secure the compression spring 174 in place. For example, the proximal end insert 168 can be fastened to a boss 196 of the UCS 100, prior to the installation or the coupling of the cup 192, the plug 194, and/or the fastener 193, through the proximal end insert 168. In this example, the installation and the structure of the boss 196, can further hold the proximal end insert 168 in place. The butt pad 104c can then be fastened from the rear, e.g., the proximal end, into both the proximal end insert 168 and the UCS 100, e.g., the lower stock body 104a and/or the upper stock body 104b. Thus, the interconnectivity of all parts of the UCS 100 when installed can greatly strengthen the overall assembly.

Cheek Riser or Weld Height Adjustment Features of the UCS 100

[0174]As depicted in FIGS. 21-23B among others, the UCS 100 can include or define a cheek riser adjustment assembly 2100. In these embodiments, the UCS 100 and the cheek riser adjustment assembly 2100 can be referred to herein as the stock system. The cheek riser adjustment assembly 2100 can enable or permit adjustability in height, e.g., of a cheek riser 2105. For example, the cheek riser adjustment assembly 2100 can enable or permit adjustability of comb-height on the stock 100, which can assist a user in setting a desired eye alignment with the sight of the firearm. The cheek riser adjustment assembly 2100 and/or the UCS 100 can include the cheek riser 2105.

[0175]The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include an upper portion or body 2107. The upper body 2107 can include a curvature. The curvature of the upper body 2107 can correspond to, e.g., match a curvature of the upper stock body 104b. The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include a lower portion or leg 2108, such as two legs 2108. The legs 2108 can extend from the upper body 2107. The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include a first or interior surface 2110. The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include a second or exterior surface 2115. The exterior surface 2115 and the interior surface 2110 can be opposite each other.

[0176]The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include a longitudinal extension 2120. The longitudinal extension 2120 can extend from the interior surface 2110. For example, the longitudinal extension 2120 can extend from the interior surface 2110 of the upper body 2107. The longitudinal extension 2120 can extend along a length of the cheek riser 2105, e.g., defined by a longitudinal axis of the cheek riser 2105. The longitudinal extension 2120 can interface with the UCS 100. For example, with the cheek riser 2105 coupled with the UCS 100, the longitudinal extension 2120 can abut a top surface of the upper stock body 104b. The interface between the longitudinal extension 2120 and the upper stock body 104b can permit or enable further securement between the cheek riser 2105 and the upper stock body 104b such that shifting, rocking, or movement therebetween is inhibited or prevented.

[0177]The cheek riser adjustment assembly 2100 and/or the cheek riser 2105 can include a lateral extension 2125, e.g., a plurality of lateral extensions 2125. The lateral extensions 2125 can extend from the interior surface 2110. For example, the lateral extensions 2125 can extend from the interior surface 2110 of the upper body 2107. In some examples, the lateral extensions 2125 can extend from the interior surface 2110 of the upper body 2107 and the legs 2108. Each lateral extension 2125 can extend along a width of the cheek riser 2105. For example, the lateral extension 2125 can extend from a first inner side surface of the cheek riser 2105 to a second inner side surface of the cheek riser 2105. For example, the lateral extension 2125 can extend laterally along the interior surface 2110 in a direction substantially orthogonal to the longitudinal axis of the cheek riser 2105. The lateral extensions 2125 can be positioned along the length of the cheek riser 2105, e.g., spaced apart from each other along the length of the cheek riser 2105.

[0178]The lateral extension 2125 can be shaped to pass through or around the longitudinal extension 2120. For example, the lateral extensions 2125 and the longitudinal extension 2120 can be formed as integral components or separate components fit together. The lateral extension 2125 can interface with the UCS 100. For example, with the cheek riser 2105 coupled with the UCS 100, the lateral extensions 2125 can abut the top surface and side surfaces of the upper stock body 104b. The interface between the lateral extensions 2125 and the upper stock body 104b can permit or enable further securement between the cheek riser 2105 and the upper stock body 104b such that shifting, rocking, or movement therebetween is inhibited or prevented.

[0179]The check riser adjustment assembly 2100 and/or the cheek riser 2105 can include an extension 2130, e.g., a plurality of extensions 2130. For example, a first extension 2130 can be positioned near a first end of the first leg 2108, a second extension 2130 can be positioned near a second end of the first leg 2108, a third extension 2130 can be positioned near a first end of the second leg 2108, and a fourth extension 2130 can be positioned near a second end of the second leg 2108. In other examples, a first extension 2130 can be positioned between, e.g., extending between, the first end and the second of the first leg 2108, and a second extension 2130 can be positioned between, e.g., extending between, the first end and the second of the second leg 2108. The extensions 2130 can extend from the interior surface 2110. For example, the extensions 2130 can extend from the interior surface 2110 of the first leg 2108 and/or the second leg 2108.

[0180]The UCS 100, e.g., the upper stock body 104b, can include or define a slot 180, as depicted in FIGS. 1 and 21 among others. The slot 180 can enable or permit the coupling of the cheek riser 2105 with the UCS 100. For example, the extensions 2130 can couple with the slot 180. The extensions 2130 can be shaped to interface with the slot 180 and/or the slot 180 can be shaped to interface with the extensions 2130. For example, the extensions 2130 can extend into and latch onto the slot 180. For example, the slot 180 can receive the extensions 2130. The extensions 2130 and the slot 180 can each be structured to have a snap fit with each other.

[0181]The cheek riser 2105 can include or define a slot or indent, e.g., a plurality of slots or indents. The interior surface 2110 and/or the exterior surface 2115 can define the indents. The indent of the interior surface 2110 can be along a base line of the leg 2108, e.g., each leg 2108 can define an indent. The indent can assist or enable removal of the cheek riser 2105 from the UCS 100. For example, a user can engage the leg 2108 and/or the indent and pry the cheek riser 2105 away from the UCS 100, e.g., disengage the extensions 2130 from the slot 180, and lift the cheek riser 2105 off the UCS 100.

[0182]The cheek riser adjustment assembly can include one or more interchangeable cheek risers. For example, a first check riser 2205 is depicted in FIGS. 22A-B and a second cheek riser 2305 is depicted in FIGS. 23A-B. Each of the interchangeable cheek risers 2205, 2305 can couple with or fit onto UCS 100. For example, each of the interchangeable cheek risers 2205, 2305 can include features that are similar to or the same as the cheek riser 2105, such as the extensions 2130.

[0183]The first cheek riser 2205 can include a height The second cheek riser 2305 can include a height. The height of the second cheek riser 2305 can be less than the height of the first cheek riser 2205 and the height of the first cheek riser 2205 can be greater than the height of the second cheek riser 2305. In this way, the first cheek riser 2205 and the second cheek riser 2205 can enable or permit adjustability in height between the cheek risers 2205, 2305.

[0184]The cheek riser adjustment assembly 2100 can include additional cheek risers including heights different than, e.g., either greater than or less than, the heights of the cheek risers 2205, 2305. For example, the one or more interchangeable cheek risers can include three cheek risers, each defining a different height, that can each include an extension similar to or the same as the extension 2130 that can couple with or interface with the slot 180. The three cheek risers can permit or enable height increases, such as height increases of 0.5 inches (such as the second cheek riser 2305 depicted in FIGS. 23A-B) and 0.75 inches (such as the first cheek riser 2205 depicted in FIGS. 22A-B) above the UCS 100, e.g., the upper stock body 104b. Additional height adjustments, e.g., less than about 0.5 inches, greater than about 0.75 inches, and/or adjustments between 0.5 inches and 0.75 inches, are within the scope of this disclosure. A user can select a desired cheek riser, and thus a desired cheek riser height, e.g., based on a preference of the user and/or weapon platform configuration.

[0185]The cheek riser 2105, e.g., the interchangeable cheek risers, such as the first cheek riser 2205 and the second cheek riser 2305, can be reversible. For example, the cheek riser 2105 can mount along a length of the upper stock body 104b and a first end of the cheek riser 2105 can be closer to the proximal end 190 of the UCS 100 than a second end of the cheek riser 2105, or the first end of the cheek riser 2105 can be closer to the distal end 191 of the UCS 100 than the second end of the cheek riser 2105. The reversibility of the cheek riser 2105 can permit a cantilever extension to extend towards the front, e.g., the distal end 191, or the rear, e.g., the proximal end 190, of the UCS 100.

[0186]In couplings with the first end of the cheek riser 2105 closer to the distal end 191 of the UCS 100, the cantilever extension can overhang, e.g., toward the distal end 191 of the UCS 100. In these examples, a user can have increased cheek contact with the UCS 100 than with the cheek riser 2105 coupled in the opposite orientation, e.g., when firing from a prone position. In couplings with the first end of the cheek riser 2105 closer to the proximal end 190 of the UCS 100, the cantilever extension can overhang, e.g., toward the proximal end 190 of the UCS 100. In these examples, the UCS 100 can offer additional clearance for rearward protruding features, such as charging handles, than with the cheek riser 2105 coupled in the opposite orientation. Additionally, the coupling with the first end of the cheek riser 2105 closer to the proximal end 190 of the UCS 100 can enable or position the cheek riser 2105 in a location more suitable for firing from a standing position, e.g., as opposed to the coupling with the first end of the cheek riser 2105 closer to the distal end 191 of the UCS 100, since a more natural “heads up” posture is enabled.

[0187]FIG. 22A depicts the first cheek riser 2205 in a first orientation 2210. FIG. 22B depicts the first check riser 2205 in a second orientation 2215. FIG. 23A depicts the second cheek riser 2305 in a first orientation 2310. FIG. 23B depicts the second cheek riser 2305 in a second orientation 2315. With the cheek risers 2205, 2305 in the first orientations 2210, 2310, the cantilever extension can overhang toward the distal end 191 of the UCS 100. With the cheek risers 2205, 2305 in the second orientations 2215, 2315, the cantilever extension can overhang toward the proximal end 190 of the UCS 100.

[0188]The first cheek riser 2205 can include or define a curvature 2220. The second cheek riser 2305 can include or define a curvature 2320. The cheek riser 2105 can include or define a curvature that is similar to or the same as either of the curvatures 2220, 2320, The curvatures 2220, 2320 can be shaped to bypass components of the UCS 100, e.g., to reduce, inhibit, or prevent interference between the cheek risers 2205, 2305 and the components of the UCS 100. For example, with the cheek risers 2205, 2305 in the second orientations 2215, 2315, the respective curvatures 2220, 2320 can curve around the components of the UCS 100, as depicted in FIGS. 22B and 23B among others.

[0189]The terms and expressions employed herein are used as terms and expressions of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof. Each of the various elements disclosed herein may be achieved in a variety of manners. This disclosure should be understood to encompass each such variation, be it a variation of an embodiment of any apparatus embodiment, a method or process embodiment, or even merely a variation of any element of these. Particularly, it should be understood that the words for each element may be expressed by equivalent apparatus terms or method terms—even if only the function or result is the same. Such equivalent, broader, or even more generic terms should be considered to be encompassed in the description of each element or action. Such terms can be substituted where desired to make explicit the implicitly broad coverage to which this invention is entitled.

[0190]As but one example, it should be understood that all action may be expressed as a means for taking that action or as an element which causes that action. Similarly, each physical element disclosed should be understood to encompass a disclosure of the action which that physical element facilitates. Regarding this last aspect, by way of example only, the disclosure of a “protrusion” should be understood to encompass disclosure of the act of “protruding”—whether explicitly discussed or not—and, conversely, were there only disclosure of the act of “protruding”, such a disclosure should be understood to encompass disclosure of a “protrusion”. Such changes and alternative terms are to be understood to be explicitly included in the description.

[0191]Other examples and implementations are within the scope and spirit of the disclosure and appended claims. Thus, the foregoing descriptions of the specific examples described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the examples to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.