Patent Publication Number: US-10767952-B1

Title: Modular muzzle device adapter system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This patent application claims the benefit of U.S. Patent Application Ser. No. 62/747,435, filed Oct. 18, 2018, the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable. 
     REFERENCE TO SEQUENCE LISTING, A TABLE, OR A COMPUTER PROGRAM LISTING COMPACT DISC APPENDIX 
     Not Applicable. 
     NOTICE OF COPYRIGHTED MATERIAL 
     The disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. Unless otherwise noted, all trademarks and service marks identified herein are owned by the applicant. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates generally to the field of firearms. More specifically, the present disclosure relates to a modular muzzle device adapter system for a firearm. 
     2. Description of Related Art 
     The firing of a handgun is accompanied by a recoil action which manifests itself in the form of a sudden upward movement of the handgun, jerking the handgun away from the target, known as muzzle flip. This is extremely disadvantageous especially when it is desirous to repeatedly fire the handgun in rapid succession, the recoil action requiring that the handgun be rapidly returned to the desired position and steadied in order to be assured that the next projectile to be fired will strike the target at the desired location. 
     A compensator is a device that is attached to the terminal end of a muzzle of a firearm that redirects propellant gases to counter recoil and unwanted firearm barrel rise that normally occurs during the typical firing sequence. Compensators, muzzle brakes, or other muzzle devices are typically attached to a firearm barrel via interaction between internal threads of the muzzle device and external threads at the muzzle end of the firearm barrel. 
     During normal operation of a firearm, and particularly a rifle, when a round is fired, gas from the burning propellant forces the bullet through the firearm barrel. As the bullet travels down and out of the firearm barrel, the bullet and the propellant gases act on firearm barrel, along the longitudinal axis, or centerline, of the firearm barrel, to produce a recoil force. Because of the difference between the longitudinal axis of the firearm barrel and the average point of contact between the firearm and the user (the average point where the user resists the recoil force), the muzzle end of the firearm&#39;s firearm barrel rotates upward. 
     Compensators typically utilize one or more slots, vents, holes, and/or baffles to divert and/or redirect the propellant gases as they leave the firearm barrel. Generally, compensators divert and/or redirect the propellant gases horizontally (left and right), at some angle that is substantially perpendicular to the longitudinal axis of the firearm barrel. 
     Existing compensators for handguns are typically made of one-piece construction and do not allow for customization for individual users. 
     Any discussion of documents, acts, materials, devices, articles, or the like, which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base, were widely known, or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each claim of this application. 
     BRIEF SUMMARY OF THE INVENTION 
     Unfortunately, there is no current design that allows for the fast and repeatable attachment of a muzzle device (i.e., compensators, flash hiders, suppressors, bayonets, lights, front sights, camera module, etc.) to a firearm barrel in a manner that ensures correct and repeatable timing of the device relative to the firearm barrel. 
     The modular muzzle device adapter system of the present disclosure overcomes the disadvantages of the conventional handgun with or without conventional compensator system and achieves the above-mentioned objectives through the employment of a modular muzzle device adapter system, which is characterized by comprising an adapter further comprising an attachment means for coupling the adapter to a handgun and a bore configured to allow a projectile to pass through; and a muzzle device configured to removably attach to the adapter. In various exemplary embodiments, the muzzle device further comprises at least one muzzle device port located on a top portion of the muzzle device. 
     In various exemplary, nonlimiting embodiments, the modular muzzle device adapter system of the present disclosure comprises at least some of an adapter and a muzzle device. In various exemplary, nonlimiting embodiments, the adapter further comprises an attachment means for coupling the adapter to a handgun and an adapter barrel aperture or bore configured to allow a projectile to pass through the adapter. 
     In various exemplary, nonlimiting embodiments, the adapter has a generally rectangular shape with a protrusion extending from a bottom surface of the adapter. In various exemplary embodiment, the protrusion houses a spring biased detent that optionally extends out of the adapter mating surface. The protrusion optionally further comprises a recess configured to hold a spring tensioning element and a detent. The detent is optionally held in place such that a small portion of the detent extends out of the adapter. 
     The adapter optionally further comprises an extension of the mating surface where the extension further comprises an angled edge. The angled edge of the mating surface extension optionally forms an acute angle. Alternatively, the angled edge of the adapter mating surface extension is a tabbed edge. 
     The muzzle device is optionally a tubular shape with a flat mating surface on a first end and an enclosed face on a second end. Both the flat mating surface and the enclosed face further comprise a through hole sized just larger than the adapter barrel aperture of a handgun. The flat mating surface optionally further comprises a lip around a plurality of edges where the lip extends outward from the mating surface. 
     The muzzle device mating surface optionally further comprises a hole in a bottom portion of the mating surface. The lip is optionally angled to match the angled edge of the adapter mating surface extension. Alternatively, the lip is comprised of a squared slotted edge. Thus, the muzzle device is optionally removably attached to the adapter by sliding the lip of the muzzle device over the extension of the adapter. While the muzzle device is being slid onto the adapter, the detent is pushed back into the adapter against the spring. Once the muzzle device is in place the detent is pushed outwardly by the spring such that the detent is inserted into the hole on the muzzle device mating surface. 
     The muzzle device optionally further comprises at least one muzzle device port located on a top portion of the compensation module. Alternatively, the compensation module optionally further comprises at least one muzzle device port on each side of the compensation module. 
     The attachment means for the adapter to removably couple to the firearm barrel optionally comprises a portion of the adapter barrel aperture to be threaded such that the threaded portion of the adapter barrel aperture matches a threaded firearm barrel. Alternatively, the attachment means is an elongated section configured to slide onto a standard picatinny rail on the underside of a handgun frame. This alternate embodiment could also include at least one fastener configured to extend through the elongated section and tighten against the picatinny rail to hold the adapter in place. 
     In various exemplary, nonlimiting embodiments, the modular muzzle device adapter system of the present disclosure comprises at least some of an adapter, wherein the adapter comprises an adapter body portion and an adapter projection portion, and wherein the adapter includes an adapter barrel aperture formed so as to extend through the adapter; and a muzzle device, and wherein the muzzle device comprises a muzzle device body portion and a muzzle device recess, wherein the muzzle device is repeatably securable to and removable from the adapter, via at least some interaction between the adapter projection portion of the adapter and the muzzle device recess of the muzzle device. 
     In various exemplary, nonlimiting embodiments, an adapter projection is formed as a portion of the adapter projection portion of the adapter, and wherein at least a portion of the muzzle device recess is mateable with the adapter projection. 
     In various exemplary, nonlimiting embodiments, the adapter projection is a dovetail projection and the muzzle device recess is a dovetail muzzle device recess, and wherein the muzzle device is attachable to the adapter via slidable interaction between at least a portion of the adapter projection and at least a portion of the muzzle device recess. 
     In various exemplary, nonlimiting embodiments, the adapter projection is a 3-sided dovetail projection and the muzzle device recess is a 3-sided dovetail muzzle device recess, and wherein the muzzle device is attachable to the adapter via slidable interaction between at least a portion of the adapter projection and at least a portion of the muzzle device recess. 
     In various exemplary, nonlimiting embodiments, the adapter projection comprises one or more projection locking extensions and the muzzle device recess comprises a muzzle device aperture opening having one or more keyhole slots, wherein each keyhole slot corresponds to one of the projection locking extensions, and wherein the muzzle device is attachable to the adapter via at least partial rotatable interaction between at least a portion of the adapter projection and at least a portion of the muzzle device recess. 
     In various exemplary, nonlimiting embodiments, the adapter barrel aperture extends through the adapter, from a proximal end of the adapter to a distal end of the adapter, substantially parallel to a longitudinal axis, AL, of the adapter. 
     In various exemplary, nonlimiting embodiments, a barrel aperture threaded portion is formed in at least a portion of the adapter barrel aperture, wherein the barrel aperture threaded portion is formed so as to interact with a threaded portion of a firearm barrel such that the adapter may optionally be threadably secured to a firearm barrel, via interaction of the external muzzle threads of the firearm barrel and the internal threads of the barrel aperture threaded portion. 
     In various exemplary, nonlimiting embodiments, one or more fastening element apertures are formed through at least a portion of the adapter body portion, wherein each fastening element aperture is formed so as to allow a fastening element to extend through the adapter body portion and into the adapter barrel aperture, such that the adapter may optionally be secured to a firearm barrel, via frictional engagement between the firearm barrel and at least a portion of the one or more fasteners extending into the adapter barrel aperture. 
     In various exemplary, nonlimiting embodiments, the one or more fastening element apertures are formed proximate a non-threaded portion of the adapter barrel aperture. 
     In various exemplary, nonlimiting embodiments, the one or more fastening element apertures are formed through at least a portion of the adapter body portion, within the barrel aperture threaded portion. 
     In various exemplary, nonlimiting embodiments, a detent is slidably positioned within an adapter detent aperture of the adapter, wherein the adapter detent aperture is formed at a distance spaced apart from the adapter barrel aperture, wherein the detent is repeatably slidable between an engaged position and a disengaged position, wherein at least a portion of the detent extends from the adapter in the engaged position, and wherein the detent is retracted within the adapter is the disengaged position. 
     In various exemplary, nonlimiting embodiments, the detent is spring biased to the engaged position. 
     In various exemplary, nonlimiting embodiments, a muzzle device detent aperture is formed at a distance spaced apart from the muzzle device aperture, wherein the muzzle device detent aperture is formed so as to receive at least a portion of the detent at least partially therein when the muzzle device detent aperture is aligned with the adapter detent aperture and the detent is in the engaged position. 
     In various exemplary, nonlimiting embodiments, the muzzle device muzzle device includes a muzzle device aperture formed such that when the muzzle device is appropriately attached or coupled to the adapter, the muzzle device aperture is aligned with the adapter barrel aperture. 
     In various exemplary, nonlimiting embodiments, the muzzle device includes one or more muzzle device ports formed through a portion of the muzzle device body portion, extending from a portion of the muzzle device aperture to an outer surface of the muzzle device body portion. 
     In various exemplary, nonlimiting embodiments, the adapter or the muzzle device includes front sight. 
     In various exemplary, nonlimiting embodiments, the adapter or the muzzle device includes a dovetail or other sight recess formed in a portion thereof to allow a front sight to be installed on the adapter or the muzzle device. 
     In various exemplary, nonlimiting embodiments, the modular muzzle device adapter system of the present disclosure comprises at least some of an adapter, wherein the adapter comprises an adapter body portion and an adapter projection portion, wherein the adapter includes an adapter barrel aperture formed so as to extend through the adapter, wherein an adapter projection is formed as a portion of the adapter projection portion of the adapter, wherein at least a portion of the muzzle device recess is mateable with the adapter projection, and wherein one or more fastening element apertures are formed through at least a portion of the adapter body portion, wherein each fastening element aperture is formed so as to allow a fastening element to extend through the adapter body portion and into the adapter barrel aperture, such that the adapter may optionally be secured to a firearm barrel, via frictional engagement between the firearm barrel and at least a portion of the one or more fasteners extending into the adapter barrel aperture; and a muzzle device, wherein the muzzle device comprises a muzzle device body portion and a muzzle device recess, wherein the muzzle device is repeatably securable to and removable from the adapter, via at least some interaction between the adapter projection portion of the adapter and the muzzle device recess of the muzzle device, and wherein the muzzle device muzzle device includes a muzzle device aperture formed such that when the muzzle device is appropriately attached or coupled to the adapter, the muzzle device aperture is aligned with the adapter barrel aperture. 
     Although the modular muzzle device adapter system of the present disclosure has been described by way of example, it should be appreciated that variations and modifications may be made without departing from the scope of the present disclosure. Furthermore, where known equivalents exist to specific features, such equivalents are incorporated as if specifically referred to in this specification. 
     In various exemplary embodiments of the present disclosure, there is provided a modular muzzle device adapter system wherein the adapter is removably attached to the muzzle device such that the mating surfaces fit flush. 
     In various exemplary embodiments of the present disclosure, there is provided a modular muzzle device adapter system where the adapter further comprises an attachment means for removably coupling the adapter to a firearm. 
     Accordingly, the presently disclosed systems, methods, and/or apparatuses provide a modular muzzle device adapter system that allows for the removable attachment or coupling of a muzzle device to an adapter. 
     The presently disclosed systems, methods, and/or apparatuses separately provide a modular muzzle device adapter system that can be quickly and easily retrofitted to an existing firearm barrel. 
     The presently disclosed systems, methods, and/or apparatuses separately provide a modular muzzle device adapter system that can be quickly and easily manipulated by a user. 
     These and other aspects, features, and advantages of the present disclosure are described in or are apparent from the following detailed description of the exemplary, non-limiting embodiments of the present disclosure and the accompanying figures. Other aspects and features of embodiments of the present disclosure will become apparent to those of ordinary skill in the art upon reviewing the following description of specific, exemplary embodiments of the present disclosure in concert with the figures. While features of the present disclosure may be discussed relative to certain embodiments and figures, all embodiments of the present disclosure can include one or more of the features discussed herein. Further, while one or more embodiments may be discussed as having certain advantageous features, one or more of such features may also be used with the various embodiments of the systems, methods, and/or apparatuses discussed herein. In similar fashion, while exemplary embodiments may be discussed below as device, system, or method embodiments, it is to be understood that such exemplary embodiments can be implemented in various devices, systems, and methods of the present disclosure. 
     Any benefits, advantages, or solutions to problems that are described herein with regard to specific embodiments are not intended to be construed as a critical, required, or essential feature(s) or element(s) of the present disclosure or the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       As required, detailed exemplary embodiments of the present disclosure are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the systems, methods, and/or apparatuses that may be embodied in various and alternative forms, within the scope of the present disclosure. The figures are not necessarily to scale; some features may be exaggerated or minimized to illustrate details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present disclosure. 
       The exemplary embodiments of the presently disclosed systems, methods, and/or apparatuses will be described in detail, with reference to the following figures, wherein like reference numerals refer to like parts throughout the several views, and wherein: 
         FIG. 1  illustrates an upper, front perspective view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 2  illustrates an upper, front perspective view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 3  illustrates a lower, front perspective view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 4  illustrates a lower, rear perspective view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 5  illustrates a right side view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 6  illustrates a left side view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 7  illustrates a top view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 8  illustrates a bottom view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 9  illustrates an exploded, side view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 10  illustrates an exploded, side, cross-sectional view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 11  illustrates a top view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 12  illustrates a bottom view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 13  illustrates a partially exploded, right side view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 14  illustrates a partially exploded, right side, cross-sectional view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 15  illustrates a partially exploded, right side, cross-sectional view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 16  illustrates a partially exploded, right side, cross-sectional view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 17  illustrates an upper, rear, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 18  illustrates a rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 19  illustrates a front, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 20  illustrates a rear view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 21  illustrates a front view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 22  illustrates a front, perspective view of an exemplary embodiment of a muzzle device aligned with an adapter, according to the present disclosure; 
         FIG. 23  illustrates a rear, perspective view of an exemplary embodiment of a muzzle device aligned with an adapter, according to the present disclosure; 
         FIG. 24  illustrates a side, cross-sectional view of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 25  illustrates a rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 26  illustrates a front, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 27  illustrates a rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 28  illustrates a front, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 29  illustrates an exploded, side view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 30  illustrates an exploded, side, cross-sectional view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 31  illustrates an upper, front, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 32  illustrates a lower, front, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 33  illustrates a front, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 34  illustrates an upper, front, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 35  illustrates a left, rear, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 36  illustrates a right, rear, perspective view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 37  illustrates a right side view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 38  illustrates a left side view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 39  illustrates a front view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 40  illustrates a rear view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 41  illustrates a top view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 42  illustrates a bottom view of an exemplary embodiment of an adapter, according to the present disclosure; 
         FIG. 43  illustrates a left, rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 44  illustrates a right, rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 45  illustrates a bottom, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 46  illustrates a top, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 47  illustrates a front view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 48  illustrates a rear view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 49  illustrates a right side view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 50  illustrates a cross-sectional view, taken along line  50 - 50  of  FIG. 49 , of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 51  illustrates a cross-sectional view, taken along line  51 - 51  of  FIG. 49 , of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 52  illustrates an upper, right, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 53  illustrates a lower, right, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 54  illustrates an upper, rear, perspective view of an exemplary embodiment of a muzzle device, according to the present disclosure; 
         FIG. 55  illustrates an exploded, cross-sectional view of certain exemplary components of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 56  illustrates a right side view of certain exemplary components of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 57  illustrates an exploded, side view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 58  illustrates an exploded, side, cross-sectional view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 59  illustrates an exploded, side, cross-sectional view of an exemplary embodiment of various detent components of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 60  illustrates a right side view of certain exemplary components of an exemplary embodiment of a modular muzzle device adapter system, according to the present disclosure; 
         FIG. 61  illustrates a right side view of an exemplary firearm barrel to be utilized in conjunction with various exemplary embodiments of a modular muzzle device adapter system, according to the present disclosure; and 
         FIG. 62  illustrates a right side view of an exemplary firearm barrel to be utilized in conjunction with various exemplary embodiments of a modular muzzle device adapter system, according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following description of the invention taken in conjunction with the accompanying drawings. 
     For simplicity and clarification, the design factors and operating principles of the modular muzzle device adapter system according to the presently disclosed systems, methods, and/or apparatuses are explained with reference to various exemplary embodiments of a modular muzzle device adapter system according to the presently disclosed systems, methods, and/or apparatuses. The basic explanation of the design factors and operating principles of the modular muzzle device adapter system is applicable for the understanding, design, and operation of the modular muzzle device adapter system of the presently disclosed systems, methods, and/or apparatuses. It should be appreciated that the modular muzzle device adapter system can be adapted to many applications where a modular muzzle device adapter system or muzzle device can be used. 
     As used herein, the word “may” is meant to convey a permissive sense (i.e., meaning “having the potential to”), rather than a mandatory sense (i.e., meaning “must”). Unless stated otherwise, terms such as “first” and “second” are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements. 
     The term “coupled”, as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically. The terms “a” and “an” are defined as one or more unless stated otherwise. 
     Throughout this application, the terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include”, (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are used as open-ended linking verbs. It will be understood that these terms are meant to imply the inclusion of a stated element, integer, step, or group of elements, integers, or steps, but not the exclusion of any other element, integer, step, or group of elements, integers, or steps. As a result, a system, method, or apparatus that “comprises”, “has”, “includes”, or “contains” one or more elements possesses those one or more elements but is not limited to possessing only those one or more elements. Similarly, a method or process that “comprises”, “has”, “includes” or “contains” one or more operations possesses those one or more operations but is not limited to possessing only those one or more operations. 
     It should also be appreciated that the terms “modular muzzle device adapter system”, “muzzle device”, “adapter”, “firearm barrel”, and “firearm” are used for basic explanation and understanding of the operation of the presently disclosed systems, methods, and/or apparatuses. Therefore, the terms “modular muzzle device adapter system”, “muzzle device”, “adapter”, “firearm barrel”, and “firearm” are not to be construed as limiting the systems, methods, and/or apparatuses of the present disclosure. Thus, for example, the term “muzzle device” is to be understood to broadly include any compensators, flash hiders, suppressors, bayonets, lights, front sights, camera modules, or other devices or tools that a user may wish to attach or couple to a firearm barrel. 
     For simplicity and clarification, the modular muzzle device adapter system of the present disclosure will be described as being used in conjunction with a firearm barrel. However, it should be appreciated that these are merely exemplary embodiments of the modular muzzle device adapter system and are not to be construed as limiting the presently disclosed systems, methods, and/or apparatuses. Thus, the modular muzzle device adapter system of the present disclosure may be utilized in conjunction with any firearm barrel or device. 
     Turning now to the drawing FIGS.,  FIGS. 1-30  illustrate certain elements and/or aspects of an exemplary embodiment of a modular muzzle device adapter system  100 , according to the present disclosure, while  FIGS. 31-55  illustrate certain elements and/or aspects of an exemplary embodiment of a modular muzzle device adapter system  100 , according to the present disclosure. 
     In the form of the present disclosure chosen for purposes of illustration,  FIGS. 1-30  show various exploded, partially exploded, and assembled views of the modular muzzle device adapter system  100 , removed from a firearm. In illustrative, non-limiting embodiment(s) of the present disclosure, as illustrated in  FIGS. 1-30 , the modular muzzle device adapter system  100  comprises at least some of an adapter  110  (having an adapter body portion  111  and an adapter projection portion  114 ) and an exemplary muzzle device  150  (having a muzzle device body portion  151  and a muzzle device recess  155 ). The muzzle device  150  is repeatably securable to and removable from the adapter  110 , via at least some interaction between the adapter projection portion  114  of the adapter  110  and the muzzle device recess  155  of the muzzle device  150 . 
     As illustrated most clearly in  FIGS. 11-17 , the adapter  110  includes an adapter body portion  111  that extends from a proximal end  112  to a distal end  113 . The adapter  110  has an adapter projection  115  formed in the adapter projection portion  114  of the adapter  110 . The muzzle device  150  is formed with muzzle device recess  155 , which mates with the adapter projection  115 . In various exemplary, nonlimiting embodiments, the adapter projection  115  is a dovetail adapter projection  115  and the muzzle device recess  155  in the muzzle device  150  is a mating, dovetail muzzle device recess  155 . More specifically, the illustrated adapter projection  115  is a 3-sided dovetail adapter projection  115  and the muzzle device recess  155  in the muzzle device  150  is a 3-sided dovetail muzzle device recess  155 . 
     It should be appreciated that, in various exemplary embodiments, the adapter projection  115  merely comprises a 2-sided dovetail projection, wherein the dovetail projections are on opposing sides relative to one another. In these embodiments, the muzzle device recess  155  comprises a mating, 2-sided dovetail recess. 
     The adapter  110  includes an adapter barrel aperture  120  that is formed so as to extend through the adapter  110 , from the proximal end  112  to the distal end  113 , parallel to a longitudinal axis, A L , of the adapter  110 . In certain exemplary embodiments, a barrel aperture threaded portion  123  is formed in at least a portion of the adapter barrel aperture  120 . The barrel aperture threaded portion  123 , if included, is formed so as to interact with a threaded portion of a firearm barrel, so that the adapter  110  can be utilized in conjunction with a standard firearm barrel and installed in a fashion similar to that of a standard threaded muzzle device. 
     In various exemplary embodiments, one or more fastening element apertures  125  may be formed through at least a portion of the adapter body portion  111 , proximate the non-threaded portion of the adapter barrel aperture  120 . Alternatively, one or more fastening element apertures  125  are formed through at least a portion of the adapter body portion  111 , within the barrel aperture threaded portion  123  (as illustrated by fastening element apertures  125 ′). 
     Each fastening element aperture  125  is formed so as to allow a fastening element  128  to extend through the adapter body portion  111  and into the adapter barrel aperture  120 . 
     It should be appreciated that the number and position of fastening element apertures  125  and associated fastening elements  128  is a design choice. Therefore, one or more fastening element apertures  125  may be positioned, as desired, relative to the adapter  110 . 
     In certain exemplary embodiments, the barrel aperture threaded portion  123  is not included, and the adapter  110  is attached or coupled to a firearm barrel, which may or may not include external barrel threads, via interaction of frictional engagement between the interior walls of the adapter barrel aperture  120  and the one or more fastening elements  128 . 
     In various exemplary embodiments, as illustrated herein, the fastening element  128  comprises a screw and each fastening element aperture  125  comprises an internally threaded or at least partially internally threaded aperture. It should be appreciated that in other exemplary embodiments, the fastening element  128  may comprise, for example, a roll pin and each fastening element aperture  125  may comprise a non-threaded aperture sized so as to receive and be frictionally engaged with the roll pin. 
     In various exemplary embodiments, the fastening elements  128  are screwed into the adapter  110  from the outside of the adapter  110 , toward the inside of the adapter  110 . Alternatively, the fastening elements  128  may be screwed into the adapter  110  from the inside of the adapter  110 , toward the outside of the adapter  110 . 
     In various exemplary embodiments, when the adapter  110  is threadably secured to an exemplary firearm barrel  190  (via interaction of the external muzzle threads  194  of the firearm barrel  190  and the internal threads of the barrel aperture threaded portion  123 ), the adapter  110  may optionally be further secured to the firearm barrel  190  via frictional engagement between the firearm barrel  190  and one or more fasteners  128  extending at least partially into the adapter barrel aperture  120 . 
     In certain exemplary embodiments, the external muzzle threads  194  of the firearm barrel  190  may include one or more flats  195  formed within the external muzzle threads  194  or purpose milled flat areas  193  formed in the firearm barrel body  192  of the  190  firearm barrel  190 , so as to interact with the fasteners  128 . In this manner, the fasteners  128  are able to interact with flat portions of the firearm barrel  190  in a more secure manner and are able to interact without disrupting or marring the external muzzle threads  194  of the firearm barrel  190 . Alternatively, the fasteners  128  may interact with the external muzzle threads  194  or round side portions of the firearm barrel body  192 . 
     In various exemplary embodiments, an end portion of the fastener  128  may optionally include a sacrificial element  129 , such as, for example, a brass, Teflon, plastic, rubber, or other element. If included, the sacrificial element  129  allows the fastener  128  to be urged against a portion of the firearm barrel body  192  and/or external muzzle threads  194 , without marring or damaging the firearm barrel body  192  or the external muzzle threads  194 . 
     In various exemplary embodiments, the adapter  110  may include one or more internal tabs that engage your interface to relief cuts on the barrel, to prevent the adapter  110  from rotating, for example, when the muzzle device  150  is attached to or removed from the adapter  110 . It should be appreciated that the number of fasteners  128  may optionally correspond to the number of internal tabs. 
     The adapter  110  includes an adapter detent aperture  130  that is formed so as to extend through the adapter  110 , from the proximal end  112  to the distal end  113 . In various exemplary embodiments, the adapter detent aperture  130  is also formed parallel to a longitudinal axis A L  of the adapter  110 , at a distance spaced apart from the adapter barrel aperture  120 . 
     The adapter detent aperture  130  extends from the proximal end  112  to a detent aperture threaded portion  135 . The detent aperture threaded portion  135  includes internal threads, formed so as to interact with external threads of the detent plug  145 . The adapter detent aperture  130  continues to extend from the detent aperture threaded portion  135 , through a detent body aperture portion  132 , to a detent aperture shoulder  133 . The adapter detent aperture  130  continues to extend from the detent aperture shoulder  133  to a detent head aperture portion  136 . The detent head aperture portion  136  extends to the distal end  113 . 
     In various exemplary embodiments, the adapter detent aperture  130  has a first inner diameter as the adapter detent aperture  130  extends from the detent aperture threaded portion  135 , through the detent body aperture portion  132 , to the detent aperture shoulder  133 . The detent aperture shoulder  133  is formed within the adapter detent aperture  130  and the adapter detent aperture  130  has a second, smaller, inner diameter as the adapter detent aperture  130  extends from the detent aperture shoulder  133 , through the detent head aperture portion  136 , to the distal end  113 . 
     In various exemplary, nonlimiting environments, the modular muzzle device adapter system  100  includes a detent  140 . The detent  140  includes a detent body  141  that extends to a detent shoulder  142 . A detent head  143  extends from the detent shoulder  142  of the detent head  141 . The detent head  143  has a smaller external diameter than the external diameter of the detent body  141 . A detent recess  144  is formed within the detent body  141 , so as to accept at least a portion of a spring tension element at least partially therein. 
     A detent plug  145  includes an externally threaded portion, with external threads formed so as to interact with the internal threads of the detent aperture threaded portion  135 . A detent plug projection  146  extends from a portion of the detent plug  145  and is formed so as to be aligned with and aid in maintaining the spring tension element  148  in a desired position relative to the detent plug  145 . 
     In certain exemplary embodiments, the detent  140  includes a detent plug recess  147 , which may optionally comprise a hexagonal recess, allowing a hexagonal tool driver to be used to threadably insert or retract the detent plug  145  within the detent aperture threaded portion  135  of the adapter detent aperture  130 . 
     In various exemplary embodiments, the spring tension element  148  comprises a coil spring or other similar element, capable of providing a desired degree of spring tension between the detent  140  and the detent plug  145 . 
     As illustrated most clearly in  FIGS. 13-16 , the detent  140  is spring biased within the adapter detent aperture  130  by positioning the detent  140  within the detent body aperture portion  132 , such that the detent shoulder  142  contact at least a portion of the detent aperture shoulder  133  and at least a portion of the detent head  143  extends through the detent head aperture portion  136 . The spring tension element  148  is positioned within the detent body aperture portion  132 , such that at least a portion of the spring tension element  148  is positioned within the detent recess  144 . 
     The detent plug  145  is then positioned such that the external threads of the detent plug  145  interact with the detent aperture threaded portion  135 , such that rotation of the detent plug  145  secures the detent plug  145  within the detent aperture threaded portion  135 . When appropriately secured, the detent plug projection  146  outlines a portion of the spring tension element  148  with the detent plug  145 . 
     Once installed, the detent  140  is positioned within the adapter detent aperture  130 , such that the detent  140  is slidably positionable between an engaged position (as illustrated in  FIG. 15 ), wherein at least a portion of the detent head  143  extends from the detent head aperture portion  136  and a disengaged position (as illustrated in  FIG. 16 ), wherein the detent head  143  is urged such that a terminal end of the detent  140  is at least flush with the distal end  113  of the adapter  110 . 
     If the detent head  143  is substantially planar, the detent head  143  may need to be physically urged between the engaged position in the disengaged position. 
     In certain alternative embodiments, as illustrated in  FIGS. 29-30 , at least a portion of the detent head  143  is rounded or spherical, such that contact between a portion of the detent head  143  and the muzzle device  150  may urge the detent  140  from engaged position to a disengaged position. 
     Thus, a detent  140  having a substantially rounded detent head  143  helps to lock the muzzle device  150  relative to the adapter  110  and also allows for quick twist off of the muzzle device  150  from the adapter  110 . 
     It should also be appreciated that in certain exemplary embodiments, the detent  140  may be a fixed bolt or fastener that maintains the muzzle device  150  relative to the adapter  110 . 
     In various exemplary embodiments, the muzzle device  150  includes a muzzle device body portion  151  that extends from an adapter end  152  to a muzzle end  153 . The muzzle device  150  has a muzzle device recess  155  formed in at least a portion of the muzzle device  150 , extending from the adapter end  152 . The muzzle device recess  155  is formed so as to be optionally slidable or otherwise mateable with the adapter projection  115 . Thus, when assembled, the muzzle device  150  is slidably secured to the end of the adapter  110  via interaction of the adapter projection  115  and the muzzle device recess  155 . 
     In various exemplary, nonlimiting embodiments, the adapter projection  115  is a dovetail adapter projection  115  and the muzzle device recess  155  in the muzzle device  150  is a mating, dovetail muzzle device recess  155 . More specifically, the illustrated adapter projection  115  is a 3-sided dovetail adapter projection  115  and the muzzle device recess  155  in the muzzle device  150  is a 3-sided dovetail muzzle device recess  155 . 
     It should be appreciated that, in various exemplary embodiments, the adapter projection  115  merely comprises a 2-sided dovetail projection, wherein the dovetail projections are on opposing sides relative to one another. In these embodiments, the muzzle device recess  155  comprises a mating, 2-sided dovetail recess. 
     Alternatively, the adapter projection  115  and the mating muzzle device recess  155  may comprise mating dovetail projection and recess elements, mating  2  or  3  plug projections and recesses, mating ratchet elements, gear elements, and the like. Thus, it should be appreciated that the adapter projection  115  and the mating muzzle device recess  155  may optionally be any known or later developed mateable pair of projections, recesses, or other elements. 
     The muzzle device  150  includes a muzzle device aperture  160  that is formed so as to extend through the muzzle device  150 , from the adapter end  152  to the muzzle end  153 , parallel to a longitudinal axis, A L , of the muzzle device  150 . When the muzzle device  150  is appropriately attached or coupled to the adapter  110 , the muzzle device aperture  160  is aligned with the adapter barrel aperture  120 , so that a projectile leaving and attached or coupled firearm barrel is able to pass through the aligned adapter barrel aperture  120  and muzzle device aperture  160 . 
     The muzzle device  150  includes a muzzle device detent aperture  165  that is formed so as to extend through the muzzle device  150 , from the adapter end  152  to the muzzle end  153 . In various exemplary embodiments, the muzzle device detent aperture  165  is also formed parallel to a longitudinal axis A L  of the muzzle device  150 , at a distance spaced apart from the muzzle device aperture  160 . 
     The muzzle device detent aperture  165  is formed so as to receive at least a portion of the detent head  143  of the detent  140  at least partially therein. In this manner, when at least a portion of the detent head  143  extends or protrudes from the distal end  113  of the adapter  110 , at least a portion of the detent head  143  is able to at least partially extend or protrude within the muzzle device detent aperture  165 . Thus, interaction between at least a portion of the detent head  143  and the muzzle device detent aperture  165  assist in maintaining the relative position of the muzzle device  150  to the adapter  110 . 
     In various exemplary embodiments, the muzzle device  150  optionally includes one or more apertures or muzzle device ports  167  are drilled or otherwise formed through a portion of the muzzle device body portion  151 . In various exemplary embodiments, the muzzle device ports  167  extend from a portion of the muzzle device aperture  160 , to the outer surface of the muzzle device body portion  151 . If the muzzle device ports  167  are tapered, they may optionally be tapered outward as they extend from the muzzle device aperture  160  or may be tapered inward as they extend from the muzzle device aperture  160 . Each of the mitigation muzzle device ports  167  provides fluid communication between at least a portion of the muzzle device aperture  160  and the exterior of the muzzle device  150 . 
     By incorporating one or more muzzle device ports  167 , as the propellant gases exit the muzzle device aperture  160 , at least a portion of the propellant gases is directed through the muzzle device ports  167  to counteract the force of recoil or muzzle rise of the firearm. 
     It should be appreciated that a variety of muzzle devices  150  may be used in connection with the adapter  110 , thus making the adapter  110  and the modular muzzle device adapter system  100  modular.  FIGS. 25-28  illustrates certain exemplary embodiments of muzzle devices  150  that may be utilized in connection with the adapter  110 . However, it should be appreciated that the muzzle devices that may optionally be utilized in connection with the adapter  110  are not limited to the illustrated muzzle devices  150  and may optionally include compensators, flash hiders, suppressors, bayonets, lights, front sights, camera module, and the like. 
     Additionally, a front sight may optionally be included as part of an exemplary muzzle device  150  or may optionally be attached or coupled to an exemplary muzzle device  150  (such as, for example, the front sight  285 ). In this manner, the sight radius of a firearm may be extended to provide increased aiming accuracy for the firearm. 
     In various exemplary embodiments, certain components of the modular muzzle device adapter system  100  are substantially rigid and are formed of aluminum. Alternate materials of construction of the various components of the modular muzzle device adapter system  100  may include one or more of the following: steel, stainless steel, titanium, and/or other metals, as well as various alloys and composites thereof, glass-hardened polymers, polymeric composites, polymer or fiber reinforced metals, carbon fiber or glass fiber composites, continuous fibers in combination with thermoset and thermoplastic resins, chopped glass or carbon fibers used for injection molding compounds, laminate glass or carbon fiber, epoxy laminates, woven glass fiber laminates, impregnate fibers, polyester resins, epoxy resins, phenolic resins, polyimide resins, cyanate resins, high-strength plastics, nylon, glass, or polymer fiber reinforced plastics, thermoform and/or thermoset materials, and/or various combinations of the foregoing. Thus, it should be understood that the material or materials used to form the various components of the modular muzzle device adapter system  100  is a design choice based on the desired appearance and functionality of the modular muzzle device adapter system  100 . 
     It should be appreciated that certain elements of the modular muzzle device adapter system  100  may be formed as an integral unit (such as, for example, the adapter body portion  111  and the adapter projection portion  114 ). Alternatively, suitable materials can be used and sections or elements made independently and attached or coupled together, such as by adhesives, welding, screws, rivets, pins, or other fasteners, to form the various elements of the modular muzzle device adapter system  100 . 
     It should also be understood that the overall size and shape of the modular muzzle device adapter system  100  and the various portions thereof, such as, for example, the adapter  110  and/or the muzzle device  150 , is a design choice based upon the desired functionality and/or appearance of the modular muzzle device adapter system  100 . 
     During installation of the modular muzzle device adapter system  100 , a terminal end of a firearm barrel is positioned within the adapter barrel aperture  120  of the adapter  110  and the external threads of the firearm barrel contact the internal threads of the barrel aperture threaded portion  123 . As the adapter  110  is rotated relative to the firearm barrel, the external threads of the firearm barrel interact with the internal threads of the barrel aperture threaded portion  123  to secure the adapter  110  to the firearm barrel. 
     When the adapter  110  is appropriately secured to the firearm barrel, one or more fasteners  128  may be utilized, via the fastening element apertures  125 , to further secure the adapter  110  to the firearm barrel. If included, interaction between the one or more fasteners  128  and the firearm barrel further resist rotation of the adapter  110  relative to the firearm barrel. Thus, the adapter  110  resist rotation, during use. 
     In various exemplary embodiments, the adapter  110  is formed such that installation of the adapter  110  on a firearm barrel is necessary in order to install the firearm barrel in the firearm slide. 
     When the adapter  110  is appropriately secured to the firearm barrel, a selected muzzle device  150  may be attached or coupled to the adapter  110 , via interaction of the adapter projection portion  114  and the muzzle device recess  155 . During attachment of the muzzle device  150 , the muzzle device  150  is aligned with the adapter  110 , such that an open portion of the muzzle device recess  155  is aligned with the adapter projection  115  of the adapter projection portion  114 . Once appropriately aligned, the muzzle device  150  is slidably urged relative to the adapter  110 , such that the adapter projection  115  is slidably positioned within the muzzle device recess  155 . 
     As the muzzle device  150  is slidably urged within the muzzle device recess  155 , a portion of the muzzle device  150  contacts the detent head  143  of the detent  140 . If the detent head  143  is substantially planar, the detent  140  may need to be physically urged from the engaged position to the disengaged position. Alternatively, if the detent head  143  is substantially rounded or spherical, continued urging of the muzzle device  150  relative to the adapter  110  may urge the detent  140  from the engaged position to the disengaged position. 
     Once the spring bias of the spring tension element  148  is appropriately overcome and the detent  140  is urged from the engaged to the disengaged position (wherein the detent  140  is slidably urged into at least a portion of the detent body aperture portion  132 ), the muzzle device  150  can be slidably positioned relative to the adapter  110 . When the muzzle device  150  is in a determined, attached position, the spring bias of the spring tension element  148  urges at least a portion of the detent head  143  of the detent body  140  from at least a portion of the detent head aperture portion  136  to interact with and be at least partially captured within a portion of the muzzle device detent aperture  165  of the muzzle device  150  to maintain the muzzle device  150  in a desired position relative to the adapter  110 . Thus, when appropriately assembled, the muzzle device  150  is slidably secured proximate the distal end  113  of the adapter  110  via interaction of the rejection  115  and the muzzle device recess  155 . 
     To remove the muzzle device  150  from the adapter  110 , the detent  140  is urged from the engaged position to the disengaged position. If the terminal end of the detent head  143  is substantially flat or planar, the detent  140  can be accessed, via the muzzle device detent aperture  165 . 
     If the terminal end of the detent head  143  is substantially circular spherical, it may not be necessary to access the detent  140 , via a muzzle device detent aperture  165 . In these exemplary environments, the muzzle device detent aperture  165  may not extend completely through the muzzle device  150 , but may only extend partially through the muzzle device  150 , from the adapter end  152 . 
     Once the detent  140  has been urged from the engaged position to the disengaged position, the muzzle device  150  is slidable, relative to the adapter  110 , to be removed from the adapter  110 . 
       FIGS. 31-59  illustrate certain elements and/or aspects of an exemplary embodiment of a modular muzzle device adapter system  200 , according to the present disclosure. As illustrated in  FIGS. 31-59 , the modular muzzle device adapter system  200  comprises at least some of an adapter  210 , an adapter body portion  211 , a proximal end  212 , a distal end  213 , an adapter barrel aperture  220 , an optional barrel aperture threaded portion  223 , one or more fastening element apertures  225  and/or  225 ′, one or more fasteners  229  (not shown), an adapter detent aperture  230 , a detent aperture threaded portion  235 , a detent body aperture portion  232 , a detent aperture shoulder  233 , a detent head aperture portion  236 , a detent  240 , a detent body  241 , a detent head  243 , a detent shoulder  242 , a detent recess  244 , a detent plug  245 , a detent plug projection  246 , a detent plug recess  247 , a spring tensioning element  248 , a muzzle device  250 , a muzzle device body portion  251 , an adapter end  252 , a muzzle end  253 , a muzzle device aperture  260 , a muzzle device detent aperture  265 , and one or more optional muzzle device ports  267 . 
     It should be understood that each of these components and/or elements correspond to and operate similarly to the adapter  110 , the adapter body portion  111 , the proximal end  112 , the distal end  113 , the adapter barrel aperture  120 , the optional barrel aperture threaded portion  123 , the one or more fastening element apertures  125  and/or  125 ′, the one or more fasteners  128 , the adapter detent aperture  130 , the detent aperture threaded portion  135 , the detent body aperture portion  132 , the detent aperture shoulder  133 , the detent head aperture portion  136 , the detent  140 , the detent body  141 , the detent head  143 , the detent shoulder  142 , the detent recess  144 , the detent plug  145 , the detent plug projection  146 , the detent plug recess  147 , the spring tensioning element  148 , the muzzle device  150 , the muzzle device body portion  151 , the adapter end  152 , the muzzle end  153 , the muzzle device aperture  160 , the muzzle device detent aperture  165 , and the one or more optional muzzle device ports  167 , as described above with reference to the modular muzzle device adapter system  100 . 
     However, as illustrated in  FIGS. 31-59 , the adapter projection  115  of the adapter projection portion  114  and the muzzle device recess  155  of the modular muzzle device adapter system  100  are replaced by an adapter projection  215  of an adapter projection portion  214 , and a muzzle device recess  255  of the modular muzzle device adapter system  200 . The muzzle device  250  is repeatably securable to and removable from the adapter  210 , via at least some interaction between the adapter projection portion  214  of the adapter  210  and the muzzle device recess  255  of the muzzle device  250 . 
     As illustrated, the adapter  210  has an adapter projection  215  formed in the adapter projection portion  214 . The adapter projection  215  comprises a substantially cylindrical extension from the distal end of the adapter body portion  211 . In various exemplary embodiments, at least a portion of the barrel aperture threaded portion  223  extends into at least a portion of the adapter projection  215 . 
     One or more projection locking extensions  216  extend from opposing sides of the adapter projection  215 , proximate a terminal end of the adapter projection  215 . The projection locking extensions  216  are comparatively more narrow than the remaining portion of the adapter projection  215  and an outer diameter of the adapter projection  215  is sized and shaped so as to be urged through a corresponding muzzle device aperture opening  261  of the muzzle device recess  255 . A muzzle device capture shoulder  217  is formed by each projection locking extension  216 , between each projection locking extension  216  and the distal end  213  of the adapter  210 . 
     In certain exemplary embodiments, the adapter projection  215  extends to include an adapter mating projection  205 . The adapter mating projection  205  optionally includes an O-ring recess  207  formed so as to receive and maintain an O-ring  208  within the O-ring recess  207 . If included, the O-ring  208  helps to provide an improved seal between the adapter  210  and the muzzle device  250 , when the muzzle device  250  is attached or coupled to the adapter  210 . In this manner, carbon build-up is kept out of the interface between the adapter  210  and the muzzle device  250 . This is an improvement over typical quick detach or fixed mount muzzle devices, which can become stuck on the firearm barrel and cannot be removed, due to gas leak and carbon build-up that seize the threads or lugs. In various exemplary embodiments, one or more 0-ring recesses  207  can be provided. The O-ring  208  may be formed of any desired material and may be flexible, semirigid, or rigid (i.e., for example may optionally be a metal gas ring). 
     The muzzle device aperture  260  of the muzzle device  250  includes a larger diameter muzzle device aperture opening  261  extending from the adapter end  252 , having with two, comparatively more narrow keyhole slots  262  that extend from opposing sides of the muzzle device aperture opening  261 . The muzzle device aperture openings  261  are formed by muzzle device locking extensions  256 . 
     The muzzle device recess  255  is formed within a portion of the muzzle device  250 . In various exemplary embodiments, the muzzle device recess  255  has a first inner diameter as the muzzle device recess  255  extends from the muzzle device aperture opening  261 , toward the muzzle end  253 . The muzzle device locking extensions  256  extend into at least a portion of the muzzle device recess  255  and the muzzle device recess  255  has a second inner diameter as the muzzle device recess  255  extends from the muzzle device locking extensions  256  to the muzzle end  253 . 
     The projection locking extensions  216  of adapter projection  215  are sized and shaped so as to be urged through the keyhole slots  262 . Thus, the exterior shape of the adapter projection  215  substantially corresponds to the shape of the muzzle device recess  255 . 
     In certain exemplary embodiments, the exterior shape of the adapter projection  215  may not correspond to the shape of the muzzle device recess  255 , but is of a size and shape so as to be urged through at least a portion of the keyhole slot  262 . 
     While the muzzle device aperture opening  261  is shown as having a substantially circular muzzle device aperture opening  261  and rounded keyhole slots  262 , it should be appreciated that the muzzle device aperture opening  261  may comprise a muzzle device aperture opening  261  having a square, rectangular, triangular, or any other overall shape. Likewise, the keyhole slots  262  may comprise slots having a square, rectangular, triangular, or other overall shape. Thus, the muzzle device aperture opening  261  and the keyhole slots  262  are formed so as to allow the adapter projection  215  and the projection locking extensions  216  to pass therethrough, when appropriately aligned. 
     It should be appreciated that the number, size, and placement of the projection locking extensions  216  and corresponding keyhole slots  262  is a design choice and can be varied. 
     Once the adapter  210  is attached or coupled to a firearm barrel, a desired muzzle device  250  may be rotatably attached or coupled to the adapter  210 . 
     During attachment or coupling of the muzzle device  250 , the muzzle device  250  is rotated relative to the adapter  210 , such that the adapter projection  215  and the projection locking extensions  216  are aligned with the muzzle device aperture opening  261  and the keyhole slots  262 , such that the adapter projection  215  is able to pass through the muzzle device aperture opening  261  and the projection locking extensions  216  are able to pass through the keyhole slots  262 . 
     As the muzzle device  250  continues to be urged toward the adapter  210 , the projection locking extensions  216  pass through the keyhole slots  262  until the projection locking extensions  216  are within the muzzle device recess  255 . Once the projection locking extensions  216  are appropriately positioned within the muzzle device recess  255 , the muzzle device  250  is rotated relative to the adapter  210 , such that the muzzle device capture shoulder  217  contacts and engages at least a portion of the muzzle device locking extension shoulder  257 . 
     The muzzle device  250  is then rotated such that the muzzle device  250  is rotationally aligned with the adapter  210  and the detent head  243  of the detent  240  is aligned with the muzzle device detent aperture  265  of the muzzle device  250  is aligned with the detent head aperture portion  236  of the adapter  210 . Once appropriately aligned, the detent  240  is able to act as an additional indexing device to prevent the muzzle device  250  from rotating relative to the adapter  110 , thus assist in maintaining the rotational relationship between the muzzle device  250  and the adapter  210 . 
     When the adapter  210  is appropriately secured to the firearm barrel, a selected muzzle device  250  may be attached or coupled to the adapter  210 , via interaction of the adapter projection portion  214  and the muzzle device recess  255 . During attachment of the muzzle device  250 , as the muzzle device  250  is rotatably urged within the muzzle device recess  255 , a portion of the muzzle device  250  contacts the detent head  243  of the detent  240 . If the detent head  243  is substantially planar, the detent  240  may need to be physically urged from the engaged position to the disengaged position. Alternatively, if the detent head  243  is substantially rounded or spherical, continued rotational urging of the muzzle device  250  relative to the adapter  210  may urge the detent  240  from the engaged position to the disengaged position. 
     Once the spring bias of the spring tension element  248  is appropriately overcome and the detent  240  is urged from the engaged to the disengaged position (wherein the detent  240  is rotationally urged into at least a portion of the detent body aperture portion  232 ), the muzzle device  250  can be rotationally positioned relative to the adapter  210 . When the muzzle device  250  is in a determined, rotational position, the spring bias of the spring tension element  248  urges at least a portion of the detent head  243  of the detent body  240  from at least a portion of the detent head aperture portion  236  to interact with and be at least partially captured within a portion of the muzzle device detent aperture  265  of the muzzle device  250  to maintain the muzzle device  250  in a desired position relative to the adapter  210 . Thus, when appropriately assembled, the muzzle device  250  is rotationally secured proximate the distal end  213  of the adapter  210  via interaction of the rejection  215  and the muzzle device recess  255 . 
     To remove the muzzle device  250  from the adapter  210 , the detent  240  is urged from the engaged position to the disengaged position. If the terminal end of the detent head  243  is substantially flat or planar, the detent  240  can be accessed, via the muzzle device detent aperture  265 . 
     If the terminal end of the detent head  243  is substantially circular spherical, it may not be necessary to access the detent  240 , via a muzzle device detent aperture  265 . In these exemplary environments, the muzzle device detent aperture  265  may not extend completely through the muzzle device  250 , but may only extend partially through the muzzle device  250 , from the adapter end  252 . 
     Once the detent  240  has been urged from the engaged position to the disengaged position, the muzzle device  250  is rotatable, relative to the adapter  210 , to be removed from the adapter  210 . 
     Thus, the muzzle device  250  can be rotated between an unlocked position and a locked position. When the muzzle device  250  is in the unlocked position, the adapter projection  215  aligns with the muzzle device aperture opening  261  and the projection locking extensions  216  align with keyhole slots  262 , to allow the muzzle device  250  to be unattached or removed from the adapter  210 . When the muzzle device  250  is in the locked position, the projection locking extensions  216  are misaligned with keyhole slots  262  and the muzzle device capture shoulder  217  contacts and engages at least a portion of the muzzle device locking extension shoulder  257  to keep the muzzle device  250  attached or coupled to the adapter  210 . 
     In various exemplary embodiments, a flange  219  extends from a portion of the proximal end  212 , proximate a perimeter of at least a portion of the adapter  210 . The flange  219 , if included, is formed so as to allow at least a portion of the proximal end  212  of the adapter  210  to have a smoother transition between the adapter  210  and a portion of the slide of the firearm, when the firearm is in battery. In this manner, a gap between the terminal end of the slide and the proximal end  212  of the adapter  210  is minimized. 
     In various exemplary embodiments, a front sight  285  may optionally be included as part of an exemplary muzzle device  250  (or adapter  210 ) or may optionally be attached or coupled to an exemplary muzzle device  250  (or adapter  210 ). By including a front sight  285  on the muzzle device  250 , the sight radius of a firearm may be extended to provide increased sight alignment and aiming accuracy for the firearm. In certain alternative embodiments, the front sight  285  may optionally be included as part of or attached or coupled to the adapter  210 . 
     In certain exemplary embodiments, a dovetail or other sight recess  284  may be formed in a portion of the adapter  210  (or the adapter  110 ) to allow a front sight to be installed on the adapter  210  (or the adapter  110 ). 
       FIGS. 52-54  illustrate additional exemplary embodiments of an optional muzzle device  250 . It should be appreciated that these are merely exemplary and not limiting. Thus, the muzzle device  250  may take any desired shape or form and have any desired number and/or arrangement of optional muzzle device ports  267  (including no muzzle device ports  267 ). 
     As illustrated, for example, in  FIG. 60 , the exemplary muzzle device  250  may also include an integrated or integral round counter  289 , which displays a number of rounds that have passed through the muzzle device  250 . 
     While the presently disclosed systems, methods, and/or apparatuses have been described in conjunction with the exemplary embodiments outlined above, the foregoing description of exemplary embodiments of the present disclosure, as set forth above, are intended to be illustrative, not limiting and the fundamental systems, methods, and/or apparatuses should not be considered to be necessarily so constrained. It is evident that the systems, methods, and/or apparatuses are not limited to the particular variation or variations set forth and many alternatives, adaptations modifications, and/or variations will be apparent to those skilled in the art. 
     Furthermore, where a range of values is provided, it is understood that every intervening value, between the upper and lower limit of that range and any other stated or intervening value in that stated range is encompassed within the presently disclosed systems, methods, and/or apparatuses. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges and is also encompassed within the present disclosure, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the present disclosure. 
     It is to be understood that the phraseology of terminology employed herein is for the purpose of description and not of limitation. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the presently disclosed systems, methods, and/or apparatuses belong. 
     In addition, it is contemplated that any optional feature of the inventive variations described herein may be set forth and claimed independently, or in combination with any one or more of the features described herein. 
     Accordingly, the foregoing description of exemplary embodiments will reveal the general nature of the presently disclosed systems, methods, and/or apparatuses, such that others may, by applying current knowledge, change, vary, modify, and/or adapt these exemplary, non-limiting embodiments for various applications without departing from the spirit and scope of the present disclosure and elements or methods similar or equivalent to those described herein can be used in practicing the present disclosure. Any and all such changes, variations, modifications, and/or adaptations should and are intended to be comprehended within the meaning and range of equivalents of the disclosed exemplary embodiments and may be substituted without departing from the true spirit and scope of the presently disclosed systems, methods, and/or apparatuses. 
     Also, it is noted that as used herein and in the appended claims, the singular forms “a”, “and”, “said”, and “the” include plural referents unless the context clearly dictates otherwise. Conversely, it is contemplated that the claims may be so-drafted to require singular elements or exclude any optional element indicated to be so here in the text or drawings. This statement is intended to serve as antecedent basis for use of such exclusive terminology as “solely”, “only”, and the like in connection with the recitation of claim elements or the use of a “negative” claim limitation(s).