• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present disclosure relates generally to cam pins for firearms with a rotating bolt. In certain aspects, the present disclosure provides cam pins having a curved profile along a portion of the cam pin that contacts sides of a cam slot in a bolt carrier. Sets, bolt carrier assemblies and firearms are also disclosed.
    公开号:BE1023889B1
    申请号:E2016/5687
    申请日:2016-09-09
    公开日:2017-09-06
    发明作者:Karl R. Lewis
    申请人:Krl Holding Company Inc.；
    IPC主号:
    专利说明:

    CONTOURED CAM PIN FOR A ROTATING BOLT GENERAL PRIOR ART
    The present disclosure relates generally to firearms. In particular, the present disclosure provides an improved cam pin for a bolt support system of a firearm.
    [0002] The M16 rifle is a preferred standard weapon for many institutions around the world, including the US military and numerous law enforcement agencies. Over the years, the M16 has been modified to include a large group of weapons, including semi-automatic counterparts fixed in the civil sector. In addition, the construction of the Ml6 from a 223 (5.56 mm) caliber bullet to 7.62 mm NATO and 308 Winchester was enlarged and shortened to the more compact M4 socket version of the Ml 6.
    Generally, the M16 group is based on automatic and semi-automatic rifles on a gas powered rotating bolt carrier system. The bolt carrier includes a multi-protrusion pin that engages corresponding protrusions in a barrel extension that engages the barrel to control the firing of each load of ammunition. The bolt carrier system includes a rotating mechanism that holds the bolt in place during the loading step relative to the barrel extension, and also includes a corresponding unlocking movement when a spent cartridge is removed. The bolt includes a spring loaded extractor configured to releasably engage a cartridge as it is loaded into the chamber. When the rifle is fired, the locking bolt controls the firepower by transmitting the force through the protrusions to corresponding protrusions of the barrel extension.
    When a shot is fired, gas pressure from a port downstream of the barrel is vented from the cartridge chamber and this gas pressure acts on the bolt carrier system to transfer energy in the reverse direction. As the bolt carrier system moves backward, it first rotates the bolt to unlock the bolt protrusions from the barrel extension tabs. If it retreats further, the extractor pulls the spent cartridge out of the chamber. As the cartridge exits the chamber, an ejector in the bolt pivots the cartridge around the extractor and dispenses the spent cartridge as is known in the art. As the bolt carrier system continues to move rearwardly, its movement is stopped by a spring which then pushes the bolt carrier system forward to engage and receive another load into the chamber. This process is repeated as many times as desired by a shooter until the last cartridge in a magazine has been used up.
    During repeated firing and traversal of the bolt carrier system, some components of the bolt carrier system shift and block other components of the bolt carrier system, resulting in wear on at least some of the components. In particular, it has been found that cam pins of existing bolt carrier systems suffer from wear, which can result in failure of the cam pin. Accordingly, there is a need for cam pins that are wear resistant.
    SUMMARY
    The present disclosure relates generally to cam pins for firearms with a rotating bolt. In certain aspects, the present disclosure provides cam pins having a head portion and an elongated body extending from the head portion, the elongated body having a segment engaging the cam slot and a segment engaging the bolt in that the segment engaging the cam slot has a first portion with a first cross-sectional dimension and a second portion with a second cross-sectional dimension, wherein the first cross-sectional dimension is greater than the second cross-sectional dimension and the first portion is between the head portion and the second portion.
    In some cases, the present disclosure provides an improved cam pin for a bolt support system with a rotating bolt, the cam pin having a head portion and an elongated body extending from the head portion, the improvement comprising the elongated body a curved, curved and / or stepped profile along a length of the elongated body adjacent to the cam slot of a bolt carrier, when the cam pin is inserted in a bolt and bolt carrier.
    The present disclosure also provides bolt carrier assembly sets including a bolt carrier defining a cam slot; a bolt which includes a projection and defines a cam pin opening, the bolt being slidably and rotatably received in the bolt carrier; and a cam pin having a head portion and an elongated body extending from the head portion, the elongate body having a segment engaging with the cam slot and a portion engaging with the cam slot
    Bolt engaging segment has; wherein the cam slot engaging with the cam slot engages the segment when the cam pin is received in the cam pin opening and the bolt is received in the bolt carrier; wherein the cam slot engaging segment has a first portion having a first cross-sectional dimension and a second portion having a second cross-sectional dimension; wherein the first cross-sectional dimension is greater than the second cross-sectional dimension; and wherein the first portion is between the head portion and the second portion.
    The present disclosure also provides rotary bolt firearms that include a lower receiver; an upper receiver connected to the lower receiver; a barrel assembly connected to the upper receiver; a bolt carrier assembly disposed movably in the upper receiver, the bolt carrier assembly including a bolt carrier and a bolt assembly; a cam pin having a head portion and an elongate body extending from the head portion, the elongated body having a cam-engaging segment and a bolt-engaging segment; wherein the bolt carrier defines a cam slot; wherein the bolt assembly includes a projection and is slidably and rotatably positionable in the bolt carrier, and wherein the bolt assembly defines a cam pin aperture; wherein the cam pin is received in the cam pin aperture and positioned in and interlocking with the cam slot; wherein the cam slot engaging segment has a first portion having a first cross-sectional dimension and a second portion having a second cross-sectional dimension; wherein the first cross-sectional dimension is greater than the second cross-sectional dimension; and wherein the first portion is between the head portion and the second portion.
    In some cases, the cam pin has an oblique, curved and / or stepped profile along a length of the cam pin that includes both the first and second portions and contacts sides of a cam slot in a bolt carrier. Additionally or alternatively, the cam-engaging segment may have a cross-sectional dimension equal to or less than a cross-sectional dimension of the segment engaging the stud. In some cases, the cam slot engaging segment has a central portion, a first end and a second end; the first end positioned between the central portion and the head portion and the second end positioned between the central portion and the bolt engaging portion; and wherein the central portion of the cam slot engaging segment has a larger cross sectional dimension than the first end of the cam slot engaging segment. In some cases, the central portion of the cam slot engaging segment has a larger cross sectional dimension than the segment engaging the stud.
    It is envisaged that the improvement disclosed herein may be used on cam bolts with US military and NATO M16 bolts and bolt carriers, including M4 variations and weapons based on the M16 construction, but cartridge housings for others Have caliber, like 7.62 NATO. It will be appreciated that the improved cam pins disclosed herein may be used with other weapon systems that use a rotating bolt and a cam pin assembly.
    BRIEF DESCRIPTION OF THE DRAWINGS
    FIG. 1 is a perspective view of the assembly of a rifle incorporating an exemplary bolt carrier system. FIG.
    FIG. 2 is a perspective view of a forward end of a bolt support assembly assembly with the bolt in an expanded, unlocked configuration. FIG.
    3 is a perspective view of a forward end of a bolt support assembly assembly with the bolt in a retracted, locked configuration.
    4 is a plan view of a front portion of a bolt carrier.
    Fig. 5 is a front perspective view of a bolt assembly and a cam pin.
    Fig. 6 is a rear perspective view of the pin assembly of Fig. 5 and a cam pin.
    Fig. 7 is a front view of a cam pin.
    FIG. 8 is a side view of the cam pin of FIG. 7. FIG.
    FIG. 9 is a bottom plan view of the cam pin of FIG. 7. FIG.
    Fig. 10 is a perspective view of another cam pin.
    FIG. 11 is a front view of the cam pin of FIG. 10. FIG.
    FIG. 12 is a side view of the cam pin of FIG. 10. FIG.
    FIG. 13 is a bottom plan view of the cam pin of FIG. 10. FIG.
    14 is a cross-sectional view of a bolt support assembly of FIG. 1 taken along line 14-14 with the cam pin of FIG. 10. FIG.
    FIG. 15 is a close-up view of the cam pin portion of FIG. 14. FIG.
    FIG. 16 is a close-up view of the cam slot engaging portion of the cam pin of FIG. 15. FIG.
    DETAILED DESCRIPTION OF THE DRAWINGS
    To assist in understanding the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It is understood, however, that this is not intended to limit the scope of the invention. Any changes and further modifications of the described embodiments and any other applications of the principles of the invention as described herein which will normally be apparent to those skilled in the art to which the invention pertains are intended. An embodiment of the invention is illustrated in great detail, although it will be apparent to those skilled in the art that some features not relevant to the present invention may not be presented for purposes of clarity.
    With respect to the description and claims, it should be understood that the singular forms "a," "an," "the," and the like include plural references, unless expressly stated otherwise. By way of illustration, references to "a device" or "the device" include one or more such devices and equivalents thereof. It should also be noted that directional labels such as "top", "bottom", "top", "bottom" and the like are used herein only for the reader to help the reader understand the illustrated embodiments, and it is not contemplated in that the use of these directional designations limits the described, illustrated and / or claimed features to a specific direction and / or orientation.
    With reference to Fig. 1, a rifle 100 is shown. The Rifle 100 is configured for use with 7.62mm x 51mm NATO cartridges, and resembles some
    Relation versions configured for, 308 Winchester and 5.56mm x 45mm NATO cartridges. The illustrated rifle is described by Lewis Machine & Tool Co. in Milan, Ill., USA. The rifle 100 includes a lower receptacle 102, an integral upper receptacle and a hand guard portion 104, a barrel assembly 106, and a bolster assembly assembly 108. The lower receptacle 102 includes shaft 110, trigger assembly 112, magazine 114, and handle 116.
    The integral upper receiver and hand guard portion 104 includes an upper receiver portion 118 and a hand guard portion 120. An upper rail 122 extends over the upper receiver portion 118 and the hand guard portion 120. In the illustrated embodiment, the integral upper receiver and hand guard portion 104 is integrally formed constructed in a single piece. In other embodiments, the integral upper receiver and hand guard portion 104 may be constructed of a plurality of interconnected parts. In other other embodiments, the integral upper receiver and hand guard portion 104 may be replaced with a conventional upper receiver and separable handguard portion, as is known in the art.
    With reference to FIGS. 2-3, the bolt support assembly 108 includes a bolt carrier 130, a bolt assembly 132, and a cam pin 134. The bolt assembly 132 is slidably and rotatably mounted in the bolt carrier 130. The bolt assembly 132 includes a bolt 140 having protrusions 144 on the forward end of the bolt 140 that are separably engageable with a portion of the race assembly 106. A striker (not shown) extends through a central bore through the bolt 140. The cam pin 134 extends through a cam slot 150 which is in the
    Bolzenträger 130 is defined, and extends into a cam pin opening 146 in the bolt 140 (as shown in Fig. 5 and 6).
    As best shown in FIG. 4, the cam slot 150 extends longitudinally and circumferentially about a portion of a bolt carrier 130. When the bolt carrier assembly 108 is in an unlocked configuration as shown in FIG the bolt assembly 132 is in an extended position from the end of the bolt carrier 140 and the cam pin 134 is positioned at a front end of the cam slot 150. When the bolt support assembly 108 is in a locked configuration, as shown in FIG. 3, the bolt assembly 132 is in a retracted position and the cam pin 134 is positioned at a rearward end of the cam slot 150. As the bolt assembly 132 alternates between the unlocked and locked configurations, the cam pin 134 moves along a locking cam path and contacts and slides past the sides 152 of the cam slot 150, causing the bolt assembly 132 to rotate about the longitudinal axis 170 of the bolt carrier 130 to move along this. Referring to FIG. 4, the cam slot 150 includes a locked position 154, an unlocked position 156, a leading edge 158, an unlock cam path 160, a deceleration rib 162, an unlock end dwell time 164, a lock cam path 166, and a deceleration fin 168. In the locked configuration The cam pin 134 is in a locked position 154. In the unlocked configuration, the cam pin 134 is in an unlocked position 156. As the bolt assembly 132 moves from the locked position 156 to the unlocked position 156, the cam pin 134 slides on the deceleration rib 168 past and along the unlocking cam path 160 in the unlocked
    Position 156 and ultimately comes in contact with the leading edge 158. As the bolt assembly 132 moves from the unlocked position 156 to the locked position 154, the cam pin 134 slides past the deceleration rib 162 and past the lock cam path 166 to the locked position 154.
    5 and 6 show the cooperation of the bolt 140 and a cam pin 234. As mentioned above, the cam pin 234 extends into the cam pin opening 146 defined in the bolt 140. The rotation of the cam pin 234 about the longitudinal axis 170 of the bolt carrier 130 causes rotation of the bolt 140 about the longitudinal axis 170. As the cam pin 234 travels along a length of the bolt carrier 130 and contacts the sides 152 of the cam slot 150, the cam pin 234 will rotate about The longitudinal axis 170 and the bolt 140 in turn rotate about the longitudinal axis 170, so that projections 144 of the bolt with a running extension (not shown) can be locked and unlocked.
    A prior art cam pin 234, which has been extensively tested by Applicants, is shown in Figs. 7-9. The cam pin 234 has a head portion 180 and a cylindrical body portion 182. The head portion 180 has a generally rectangular cross-sectional shape defining side surfaces 190, 192, 194 and 196. When the bolt carrier assembly 108 is in the unlocked configuration, the head portion 180 is slidably received in a gas key and loading handle groove defined in the upper picker portion 118.
    The cylindrical body portion 182 includes a bolt engaging segment 200 and a cam slot engaging segment 202. The bolt engaging segment 200 defines an opening 204 for receiving a firing pin and is sized so dimensioned and arranged that it is in the
    Cam pin opening 146 of the bolt 140 can be added. The cam slot engaging segment 202 is arranged to slidably engage portions of the cam slot 150 when the bolt assembly 132 is received in the bolt carrier 130 and the bolt engaging segment 200 of the cam pin 234 in the cam pin Opening 146 of the bolt 140 is received.
    The Applicant has found that the cam pin may be subject to galling and / or chafing through the repeated cycle of the firearm along the segment engaging the cam slot. For example, Applicant has observed wear phenomena 220 on the portions of the cam slot engaging segment that slide along sides 152 of cam slot 150. Further, Applicant has observed increased wear 220 along the cam slot engaging portion closer to the head portion than the bolt engaging segment.
    Applicant considers this to be probable because the cam slot engaging portion is further away from the rotational axis (ie, the longitudinal axis 170, such as the firing pin) and thus must travel a greater distance during rotation than portion (e) of the cam pin 234, which are closer to the longitudinal axis 170.
    When the cam pin 234 rotates about the longitudinal axis 170, portions of the cam pin 234 positioned farther from the longitudinal axis 170 also move at a higher speed about the longitudinal axis 170 than portions of the cam pin 234 closer to the longitudinal axis 170 are positioned. This results in a velocity gradient along a length of the cam pin 234, and more particularly along the cam slot engaging segment 202. Accordingly, portions of the slide with the
    Cam slot engaging segment 202 at different speeds along the sides 152 of the cam slot 150 and set at each actuation other distances. Applicant is convinced that this causes a relative shear stress along the portions of the cam slot engaging segment 202, which increases the likelihood and / or occurrence of seizure and / or galling and possibly the release of metal particles into the mechanics of the rifle 100 increases, which can potentially lead to and / or contribute to a malfunction of the weapon.
    Wear phenomena 220 along the cam slot engaging segment 202 found during the applicant's study are shown in FIGS. 7 and 8. In some cases, this wear may result in increased friction between the bolt support 130 and the cam pin 234 and / or structural failure of the cam pin 234, possibly leading to a malfunction of the firearm. To solve this problem, Applicant has developed a novel cam pin 134, shown in Figs. 10-13. The cam pin 134 of FIGS. 10-13 has a head portion 180 and a cylindrical body portion 182. The head portion 180 has curved and linear side surfaces 250, 252, 254 and 256, opposite sides 252 and 256 being linear and parallel and opposite side surfaces 250 and 254 curved.
    The cylindrical body portion 182 includes a bolt engaging segment 200 and a cam slot engaging segment 202. The cylindrical body portion 182 has a length and profile that includes linear portions, curved portions, and / or stepped portions Includes sections along a portion of the length. The bolt engaging segment 200 defines an aperture 204 for receiving a firing pin and is sized and arranged to be received in the cam pin aperture 146 of the bolt 140. The cam slot engaging segment 202 is arranged to slidably engage portions of the sides 152 in the cam slot 150 when the bolt assembly 132 is received in the bolt carrier 130 and the bolt engaging segment 200 of the cam pin 134 is received in the cam pin opening 146 of the bolt 140.
    As shown in FIGS. 10-16, the segment 202 engaging the cam pin has a curved profile. The central portion 260 of the cam slot engaging segment 202 has a cross-sectional dimension 300 (eg, diameter) measured in a cross-sectional plane of the cam pin 134. The end portion 262 of the cam slot engaging segment 202 near the bolt engaging segment 200 has a cross sectional dimension 302 and the end portion 264 of the cam slot engaging segment 202 near the head portion 180 has a Cross-section dimension 304 on. Both the cross-sectional dimension 302 and the cross-sectional dimension 304 are less than the cross-sectional dimension 300 of the central portion 260. In this manner, the cam-slot-engaging segment 202 contacts only the sides 152 of the cam slot 150 along the mid-section 260, which complements the extent of the velocity gradient The length of the cam pin 134 that contacts the sides 152 of the cam slot 150 decreases, potentially reducing the likelihood and / or a drop of seizure and / or wear.
    While the above embodiments have been illustrated and described with the cam slot engaging portion having a curved profile, it is contemplated that the segment engaging the cam slot may additionally or alternatively be a stepped, sloped, tapered, or otherwise shaped profile may include.
    While the present disclosure has been shown and described in detail in the drawings and the foregoing description, it is to be considered illustrative and not restrictive, it being understood that the preferred embodiment has been illustrated and described and that all changes, equivalents, and modifications which are intended to be within the spirit of the invention as defined by the following claims. All publications, patents, and patent applications cited in this specification are hereby incorporated by reference as if each individual publication, patent, or patent application were specifically and individually identified as being incorporated by reference and listed in their entirety herein ,
    The language used in the claims and the written description and definitions above has merely its ordinary and ordinary meaning, except for the terms expressly defined above. The corresponding simple and common meaning is defined herein as including all consistent dictionary definitions from the most recent (as of the filing date of this document) generic Merriam-Webster dictionary.
    As used in the claims and the description, the following terms have the following defined meanings: The term "curved" as used herein has the meaning "having at least one curve". It includes, but is not limited to, fully curved and including one or more linear segments. It contains curves with a constant radius and non-constant radii of curvature.
    The term "scavenging" as used herein means damage caused under stress and in the presence of repeated surface movement. The seizure deteriorates the surface layer quality tangibly, and produces increased surface roughness and grainy taint, which reduces the fatigue strength of the components.
    The term "rub-up" as used herein means wear caused by adhesion between sliding surfaces, causing a first surface to be pulled with the contacting surface. Rubbing can in many cases leave some material from a first surface on the contacting second surface that potentially appears as a bulge on the second surface with a furrow on the first surface.
    The term "M16" as used herein refers to military, civilian, semi-automatic and automatic versions of the M16 rifle. This includes, but is not limited to, AR-15, M16A1, M16A2, M16A3, M16A4 and M4A1 rifles.
    The term "M16" as used herein includes versions of the M16 rifle having chambers for 223 Remington, 5.56 NATO, and 308 Winchester, as well as pistol versions (ie, butt shaft versions) and short-barreled rifles (SBR), in all of these Variation similar to a similar bolt carrier assembly is used.
    The term "profile" as used herein refers to the outline shape of an object along its length. The name includes the silhouette of an object.
    The term "wear" as used herein refers to the removal and / or deformation of material on the surface due to mechanical interaction with an interface surface. The term includes loss of size due to plastic deformation as well as impact or pulse wear.
    权利要求:
    Claims (20)
    [1]
    A cam pin for a bolt support system of a firearm with a rotating bolt, the cam pin comprising: a head portion and an elongated body extending from the head portion; wherein the elongated body has a segment engaging with the cam slot and a segment engaging with the pin; wherein the cam slot engaging segment has a first portion having a first cross-sectional dimension and a second portion having a second cross-sectional dimension; wherein the first cross-sectional dimension is greater than the second cross-sectional dimension; and wherein the first portion is disposed between the head portion and the second portion.
    [2]
    The cam pin of claim 1, wherein: the segment engaging the cam slot has an oblique profile along a length of the cam slot engaging segment that includes both the first and second sections.
    [3]
    The cam pin of claim 1, wherein: the segment engaging the cam slot has a curved profile that extends along a length of the cam slot engaging segment and includes both the first and second sections.
    [4]
    The cam pin of claim 1, wherein: the segment engaging the cam slot has a stepped profile that extends along a length of the cam slot engaging segment and includes both the first and second portions.
    [5]
    5. A cam pin according to any one of claims 1-4, wherein: the segment engaging the cam slot has a cross-sectional dimension equal to or less than a cross-sectional dimension of the segment engaging the pin.
    [6]
    6. A cam pin according to any one of claims 1-5, wherein: the segment engaging with the cam slot has a central portion, a first end and a second end; the first end is positioned between the central portion and the head portion and the second end is positioned between the central portion and the bolt engaging portion; and wherein the medium portion of the cam slot engaging segment has a larger cross sectional dimension than the first end of the cam slot engaging segment.
    [7]
    A cam pin according to any one of claims 1-6, wherein: the cam pin is adapted to fit and be usable with a M16 or M4 pin and bolt carrier.
    [8]
    A bolt carrier set comprising: a bolt carrier defining a cam slot; a bolt which includes a projection and defines a cam pin opening, wherein the bolt can be slidably and rotatably received in the bolt carrier; and a cam pin having a head portion and an elongate body extending from the head portion, the elongate body having a segment engaging the cam slot and a segment engaging the bolt; wherein the cam pin engaging segment engages the cam slot when the cam pin is received in the cam pin aperture and the bolt is received in the bolt carrier; wherein the cam slot engaging segment has a first portion having a first cross-sectional dimension and a second portion having a second cross-sectional dimension; wherein the first cross-sectional dimension is greater than the second cross-sectional dimension; and wherein the first portion is disposed between the head portion and the second portion.
    [9]
    The kit of claim 8, wherein: the segment engaging the cam slot has a sloping profile that extends along a length of the segment engaging the cam slot and includes both the first and second portions.
    [10]
    The kit of claim 8, wherein: the segment engaging the cam slot has a curved profile that extends along a length of the segment engaging the cam slot and includes both the first and second portions.
    [11]
    11. A kit according to any of claims 8-10, wherein: the segment engaging the cam slot has a cross-sectional dimension equal to or less than a cross-sectional dimension of the segment engaging the pin.
    [12]
    The kit of any one of claims 8-11, wherein: the segment engaging the cam slot has a central portion, a first end, and a second end; the first end positioned between the central portion and the head portion and the second end positioned between the central portion and the bolt engaging portion; and wherein the central portion of the cam slot engaging segment has a larger cross sectional dimension than the first end of the cam slot engaging segment.
    [13]
    13. A kit according to any one of claims 8-12, wherein: the bolt is received in the bolt carrier; and wherein the cam pin is received in the cam pin opening and the cam slot.
    [14]
    The kit of any one of claims 8-13, wherein: the bolt carrier is constructed and arranged to fit and be used with an Ml6 or M4.
    [15]
    15. A firing gun having a rotating bolt, comprising: a lower receiver; an upper receiver coupled to the lower receiver; a barrel clutter coupled to the upper receiver, the barrel assembly including a barrel extension; a bolt carrier assembly movably received in the upper receiver, the bolt carrier assembly including a bolt assembly and a bolt carrier defining a cam slot; and a cam pin having a head portion and an elongate body extending from the head portion, the elongate body having a segment engaging the cam slot and a segment engaging the bolt; wherein the bolt assembly is slidably and rotatably receivable in the bolt carrier and includes a projection that can be locked and unlocked with the barrel extension, the bolt assembly defining a cam pin aperture; wherein the cam pin is received in the cam pin opening and is received in the cam slot and can engage therewith; wherein the cam slot engaging segment has a first portion having a first cross-sectional dimension and a second portion having a second cross-sectional dimension; wherein the first cross-sectional dimension is greater than the second cross-sectional dimension; and wherein the first portion is disposed between the head portion and the second portion.
    [16]
    The firearm of claim 15, wherein: the segment engaging the cam slot has a curved profile that extends along a length of the cam slot engaging segment and includes both the first and second sections.
    [17]
    The firearm of claim 16, wherein: the segment engaging the cam slot has a cross-sectional dimension equal to or less than a cross-sectional dimension of the segment engaging the pin.
    [18]
    A firearm according to any one of claims 15-17, wherein: the segment engaging the cam slot has a central portion, a first end, and a second end; the first end positioned between the central portion and the head portion and the second end positioned between the central portion and the bolt engaging portion; and wherein the central portion of the cam slot engaging segment has a larger cross sectional dimension than the first end of the cam slot engaging segment.
    [19]
    A firearm according to any of claims 15-18, wherein: the segment engaging the cam slot has a sloping profile which extends along a length of the cam slot engaging segment and includes both the first and second sections ,
    [20]
    A firearm according to any one of claims 15-19, wherein: the lower receiver is a Ml6 or M4.
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    同族专利:
    公开号 | 公开日
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    BE1023889A1|2017-09-05|
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    US11092396B1|2019-04-25|2021-08-17|Edward Sugg|Barrel extension and further improvements|
    CZ308600B6|2019-11-12|2020-12-23|Česká Zbrojovka A.S.|Firearms automation assembly|
    法律状态:
    2017-12-13| FG| Patent granted|Effective date: 20170906 |
    优先权:
    申请号 | 申请日 | 专利标题
    US201562217149P| true| 2015-09-11|2015-09-11|
    US62217149|2015-09-11|
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