# US 8,782,943 B2 · Quick detach barrel mounting system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,782,943 B2 - Document ID: US8782943B2 - Status: Granted - Kind: B2 - Application number: 13/662,236 - Filed: 2012-10-26 - Published: 2014-05-01 - Granted: 2014-07-22 - Earliest claimed: 2012-10-26 - Assignees: RA Brands, L.L.C. - Applicants: RA Brands, L.L.C. - Inventors: Michael Brent Jarboe - Web page: https://patentgrep.com/patent/US8782943B2 ## CPC - F41A 21/482: {using continuous threads on the barrel} - F41A 21/48: Barrel mounting means, e.g. releasable mountings for replaceable barrels - F41A 21/485: {using screws or bolts} - F41C 23/16: Forestocks; Handgrips; Hand guards (pump-action guns F41C7/02) - F41G 11/003: {Mountings with a dove tail element, e.g. "Picatinny rail systems"} - Y10T 29/49815: Disassembling - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR - F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A quick-detach barrel mounting system for removing and attaching a barrel to a receiver of a firearm. The quick-detach barrel mounting system can include a barrel nut having a body defining an axial bore. A proximal end of the barrel is received at least partially through the axial bore, and the barrel nut releasably engages a front end of the receiver. A hand guard can be mounted to the receiver and can define a cutout proximate the receiver. The hand guard at least partially encloses at least a portion of the barrel and the barrel nut, and the cutout is at least partially aligned with the barrel nut. At least a portion of the barrel nut is accessible via the cutout of the hand guard for at least partially disengaging and engaging the barrel nut with the receiver when the hand guard is mounted on the receiver. ## Claims ### Claim 1 A quick-detach barrel mounting system for removing and attaching a barrel to a receiver of a firearm, the quick-detach barrel mounting system comprising: a barrel nut having a body defining an axial bore, the axial bore at least partially receiving a proximal end of the barrel therein; and a hand guard extending forwardly from the receiver and along the barrel, the hand guard having a cutout defined proximate to the receiver, wherein the hand guard at least partially encloses at least a portion of the barrel, and the cutout is at least partially aligned with the barrel nut; wherein at least a portion of the barrel nut is accessible via the cutout of the hand guard for at least partially moving the barrel nut relative to the receiver and the hand guard to enable detachment and mounting of the barrel to the receiver while the hand guard remains in position with respect to the receiver. ### Claim 2 (depends on 1) The quick-detach barrel mounting system of claim 1, further comprising at least one mating geometry formed in a peripheral portion of the body of the barrel nut for receiving at least a portion of a tool, wherein the at least one mating geometry in the barrel nut is accessible to the tool via the cutout of the hand guard. ### Claim 3 (depends on 2) The quick-detach barrel mounting system of claim 2, wherein the at least one mating geometry comprises a plurality of mating geometries spaced around a circumference of the axial bore. ### Claim 4 (depends on 1) The quick-detach barrel mounting system of claim 1, wherein the barrel nut comprises a forward end, a rearward end, an internally threaded portion adjacent the rearward end, and a plurality of ridges formed in an exterior surface of the barrel nut. ### Claim 5 (depends on 4) The quick-detach barrel mounting system of claim 4, wherein the plurality of ridges of the barrel nut defines a plurality of generally longitudinal grooves for at least partially receiving a portion of a tool. ### Claim 6 (depends on 4) The quick-detach barrel mounting system of claim 4, further comprising at least one radial bore formed in a peripheral portion of the body of the barrel nut for receiving at least a portion of a tool, wherein the plurality of ridges of the barrel nut is formed proximate the rearward end of the barrel nut and the at least one radial bore is disposed in a portion of the barrel nut extending between the plurality of ridges and the forward end. ### Claim 7 (depends on 1) The quick-detach barrel mounting system of claim 1, wherein the axial bore of the barrel nut comprises an internally threaded portion that removably engages an externally threaded portion of a front end of the receiver. ### Claim 8 (depends on 7) The quick-detach barrel mounting system of claim 7, wherein the barrel nut comprises an outer circumference and the cutout of the hand guard is configured to extend from a top portion of the barrel nut along at least about a quarter of the outer circumference of the barrel nut on either side of the barrel nut and to extend along and beyond the front end of the receiver for facilitating easy engagement and manipulation of the barrel nut. ### Claim 9 (depends on 7) The quick-detach barrel mounting system of claim 7, further comprising a barrel extension disposed at the proximal end of the barrel, the barrel extension comprising an annular collar and a cylinder section extending between a bolt-receiving end and a barrel-receiving end of the barrel extension, the cylinder section having a threaded section therealong adapted to threadably engage the proximal end of the barrel. ### Claim 10 (depends on 9) The quick-detach barrel mounting system of claim 9, wherein the axial bore of the barrel nut comprises an intermediate annular shoulder, wherein the annular collar of the barrel extension is engaged between the intermediate annular shoulder of the barrel nut and the front end of the receiver as the barrel nut is moved toward the receiver, and the cylinder section of the barrel extension is at least partially received in the front end of the receiver. ### Claim 11 (depends on 1) The quick-detach barrel mounting system of claim 1, wherein the axial bore of the barrel nut comprises an internally threaded portion that removably engages an externally threaded portion of the proximal end of the barrel. ### Claim 12 (depends on 1) The quick-detach barrel mounting system of claim 1, wherein the cutout of the hand guard is at least partially defined by a longitudinal edge of the hand guard, a rearward-facing edge of the hand guard, and a portion of the receiver. ### Claim 13 (depends on 1) The quick-detach barrel mounting system of claim 1, wherein an upper portion of the hand guard adjacent the cutout is spaced apart from barrel nut. ### Claim 14 A quick-detach barrel mounting system for removing and attaching a barrel to a receiver of a firearm, the quick-detach barrel mounting system comprising: a barrel nut having a body defining an axial bore at least partially receiving a proximal end of the barrel therein; wherein the axial bore of the barrel nut comprises an internally threaded portion for engaging an externally threaded portion formed along the proximal end of the barrel for removably attaching the proximal end of the barrel to the receiver; and a hand guard extending forwardly from the receiver and defining a cutout proximate to the receiver, wherein the barrel is received through and extends along the hand guard, and wherein the cutout of the hand guard is at least partially aligned with the barrel nut; and a barrel bracket disposed at the proximal end of the barrel, the barrel bracket comprising a barrel-receiving bore and a flange, the proximal end of the barrel being received in the barrel-receiving bore so that at least a portion of the barrel bracket is disposed between the barrel nut and the receiver, and wherein the flange is at least partially received in a corresponding slot in a chassis of the firearm; wherein at least a portion of the barrel nut is accessible through the cutout of the hand guard, enabling the barrel nut to be movable relative to the receiver to enable detachment and mounting of the barrel to the receiver while the hand guard remains in position with the barrel extending therethrough. ### Claim 15 A firearm, comprising: a receiver comprising a front end, the front end defining a receiver bore; a barrel defining a chamber at a proximal end thereof, the proximal end of the barrel being at least partially received in the receiver bore; a hand guard at least partially enclosing at least a portion of the barrel and defining a cutout proximate the receiver, the hand guard being mounted on the receiver; and a barrel nut having a body defining an axial bore, wherein the proximal end of the barrel is received at least partially through the axial bore, and the barrel nut is at least partially aligned with the cutout of the hand guard; wherein the cutout is configured to facilitate access to at least a portion of the barrel nut through the hand guard for at least partially moving the barrel nut relative to the receiver and the hand guard to enable detachment and mounting of the barrel to the receiver of the firearm without removal of the hand guard from the receiver. ### Claim 16 (depends on 15) The firearm of claim 15, further comprising at least one mating geometry formed in a peripheral portion of the body of the barrel nut for receiving at least a portion of a tool, wherein the at least one mating geometry in the barrel nut is accessible to the tool via the cutout of the hand guard. ### Claim 17 (depends on 16) The firearm of claim 16, wherein the at least one mating geometry comprises a plurality of mating geometries spaced around a circumference of the axial bore. ### Claim 18 (depends on 15) The firearm of claim 15, wherein the barrel nut comprises a forward end, a rearward end, an internally threaded portion adjacent the rearward end, and a plurality of ridges formed in an exterior surface of the barrel nut. ### Claim 19 (depends on 18) The firearm of claim 18, wherein the plurality of ridges defines a plurality of generally longitudinal grooves for at least partially receiving a portion of a tool. ### Claim 20 (depends on 15) The firearm of claim 15, wherein the axial bore of the barrel nut comprises an internally threaded portion that removably engages an externally threaded portion of the front end of the receiver. ### Claim 21 (depends on 20) The firearm of claim 20, further comprising an annular collar extending from the barrel and comprising a first clamp face, wherein the barrel nut comprises an annular shoulder adjacent the axial bore, the front end of the receiver comprises a forward facing surface, and the annular shoulder engages the first clamp face of the annular collar to clamp the annular collar against the forward facing surface of the front end of the receiver. ### Claim 22 (depends on 21) The firearm of claim 21, further comprising a barrel extension disposed at the proximal end of the barrel, the barrel extension comprising the annular collar and a cylinder section extending rearwardly of the annular collar, wherein the barrel extension is at least partially received in the receiver bore of the receiver. ### Claim 23 (depends on 20) The firearm of claim 20, wherein the barrel nut comprises an outer circumference and the cutout of the hand guard is configured to extend from a top portion of the barrel nut along at least approximately a quarter of the outer circumference of the barrel on either side of the firearm and to extend along and beyond the front end of the receiver for facilitating easy engagement and manipulation of the barrel nut. ### Claim 24 (depends on 15) The firearm of claim 15, wherein the cutout of the hand guard is at least partially defined by a longitudinal edge of the hand guard, a rearward-facing edge of the hand guard, and a portion of the receiver. ### Claim 25 (depends on 24) The firearm of claim 24, wherein the hand guard comprises an upper extension that extends over the cutout and the receiver, the upper extension being mounted to the receiver and comprising a monolithic rail. ### Claim 26 (depends on 15) The firearm of claim 15, wherein an upper portion of the hand guard adjacent the cutout is spaced apart from barrel nut. ### Claim 27 A firearm, comprising: a receiver comprising a front end, the front end defining a receiver bore; a barrel defining a chamber at a proximal end thereof, the proximal end of the barrel being at least partially received in the receiver bore; a hand guard at least partially enclosing at least a portion of the barrel and defining a cutout proximate the receiver, the hand guard being mounted on the receiver; a barrel nut having a body defining an axial bore, wherein the proximal end of the barrel is received at least partially through the axial bore, and the barrel nut is at least partially aligned with the cutout of the hand guard; a chassis mounted to the receiver; and a barrel bracket comprising a barrel-receiving bore and a flange, the proximal end of the barrel being received in the barrel-receiving bore so that at least a portion of the barrel bracket is disposed between the barrel nut and the front end of the receiver, wherein the flange is at least partially received in a slot in the chassis; wherein the cutout of the barrel nut is configured to facilitate access to at least a portion of the barrel nut through the hand guard for at least partially moving the barrel nut relative to the receiver to enable detachment and mounting of the barrel to the receiver of the firearm without removal of the hand guard from the receiver; and wherein the barrel nut further comprises a plurality of mating geometries formed in a peripheral portion of the body of the barrel nut for receiving at least a portion of a tool, the plurality of mating geometries being spaced around a circumference of the axial bore, wherein at least one mating geometry of the plurality of mating geometries in the barrel nut is accessible to the tool via the cutout of the hand guard.