# US 10,309,739 B2 · Bolt carrier and bolt for gas operated firearms > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,739 B2 - Document ID: US10309739B2 - Status: Granted - Kind: B2 - Application number: 15/596,834 - Filed: 2017-05-16 - Published: 2018-04-05 - Granted: 2019-06-04 - Earliest claimed: 2011-08-17 - Assignees: LWRC International LLC - Applicants: LWRC International LLC - Inventors: Jesue S. Gomez - Web page: https://patentgrep.com/patent/US10309739B2 ## CPC - F41A 15/14: the ejector being mounted on or within the bolt; {Extractors per se} - F41A 3/16: the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks - F41A 3/26: semi-automatically or automatically operated, e.g. having a slidable bolt-carrier and a rotatable bolt - F41A 15/12: for bolt-action guns - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability. ## Claims ### Claim 1 A bolt for a firearm, the bolt comprising: a generally cylindrical body having a front end and a rear end and a body portion extending therebetween, near said front end there is a mating surface located within a recess, said mating surface has a gap therein to accommodate a portion of an extractor, and said body of the bolt defines an extractor recess and includes at least a first bolt lug and a second bolt lug located adjacent to said bolt's front end, said first and second bolt lugs extending radially outwardly from the exterior of said body portion, and wherein said first bolt lug and said second bolt lug define a gap therebetween which is in communication with, and wider than said extractor recess to accommodate a forward end of an extractor that is wider than said body portion; and an extractor having a forward end, a back end and a body portion extending therebetween, wherein said forward end and said back end of said extractor are wider than said body portion of the extractor, said forward end having a portion configured to engage a larger portion of an ammunition cartridge's rim circumference, and wherein said back end of said extractor serves as a bearing surface for at least one spring, said spring biases said extractor into position against said mating surface, and at least a portion of said back end of said extractor comprises at least one nipple sized and positioned where a plane, occupied by two forward edges of an extractor claw on said forward end of said extractor, intersects with and bisects said at least one nipple. ### Claim 2 A bolt carrier assembly for a firearm, the assembly comprising: a generally cylindrical body having a front end and a rear end and a body portion extending therebetween, near said front end there is a mating surface located within a recess, said mating surface has a gap therein to accommodate a portion of an extractor, and said body of the bolt defines an extractor recess and includes at least a first bolt lug and a second bolt lug located adjacent to said bolt's front end, said first and second bolt lugs extending radially outwardly from the exterior of said body portion, and wherein said first bolt lug and said second bolt lug define a gap therebetween which is in communication with, and wider than, said extractor recess to accommodate a forward end of an extractor that is wider than said body portion; and an extractor having a forward end, a back end and a body portion extending therebetween, wherein said forward end and said back end of said extractor are wider than said body portion of the extractor, said forward end having a portion configured to engage a larger portion of an ammunition cartridge's rim circumference, and wherein said back end of said extractor serves as a bearing surface for at least one spring, said spring biases said extractor into position against said mating surface, and at least a portion of said back end of said extractor comprises at least one nipple sized and positioned where a plane, occupied by two forward edges of an extractor claw on said forward end of said extractor, intersects with and bisects said at least one nipple. ### Claim 3 (depends on 2) The bolt carrier assembly of claim 2, further comprising a gas block with an extension nozzle provided on the gas block. ### Claim 4 (depends on 3) The bolt carrier assembly of claim 3, wherein said extension nozzle is secured by any of threading, welding, press fitting or combinations thereof. ### Claim 5 (depends on 3) The bolt carrier assembly of claim 3, further comprising a roll pin securing said extension nozzle. ### Claim 6 (depends on 3) The bolt carrier assembly of claim 3, further comprising a port in said gas block. ### Claim 7 (depends on 6) The bolt carrier assembly of claim 6, wherein the port is angled relative to the longitudinal axis of the assembly. ### Claim 8 (depends on 6) The bolt carrier assembly of claim 6, wherein said mating surface defines a plane which is perpendicular to the longitudinal axis of said bolt. ### Claim 9 (depends on 6) The bolt carrier assembly of claim 6, wherein said body of the bolt defines an extractor recess and includes at least a first bolt lug and a second bolt lug located adjacent to said bolt's front end, said first and second bolt lugs extending radially outwardly from the exterior of said body portion. ### Claim 10 (depends on 1) The bolt of claim 1, further comprising at least one spring well in the recess. ### Claim 11 (depends on 10) The bolt of claim 10, wherein the central axis of the at least one spring well is perpendicular to the longitudinal axis of the bolt. ### Claim 12 (depends on 10) The bolt of claim 10, wherein the at least one spring well is adapted to receive at least a portion of the at least one spring and at least a portion of a spring buffer. ### Claim 13 (depends on 1) The bolt of claim 1, wherein the back end of the extractor is a flange.