Bolt carrier and bolt for gas operated firearms
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.
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.
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.
3. The bolt carrier assembly of claim 2 , further comprising a gas block with an extension nozzle provided on the gas block.
4. The bolt carrier assembly of claim 3 , wherein said extension nozzle is secured by any of threading, welding, press fitting or combinations thereof.
5. The bolt carrier assembly of claim 3 , further comprising a roll pin securing said extension nozzle.
6. The bolt carrier assembly of claim 3 , further comprising a port in said gas block.
7. The bolt carrier assembly of claim 6 , wherein the port is angled relative to the longitudinal axis of the assembly.
8. The bolt carrier assembly of claim 6 , wherein said mating surface defines a plane which is perpendicular to the longitudinal axis of said bolt.
9. 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.
10. The bolt of claim 1 , further comprising at least one spring well in the recess.
11. 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.
12. 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.
13. The bolt of claim 1 , wherein the back end of the extractor is a flange.