5.56/223 BCG Nickel Boron Bolt Carrier Group
group (full auto version) for your AR15, M16, or M4. Nickel Boron Coated. This
M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome
lined and heat treated per USGI specifications. Gas key is secured to
carrier via USGI domestic mfg Grade 8 fasteners and properly staked per
Mil-Specs. These properly hardened parts insure a strong staking and
proper gas system functioning.
The bolt assembly is machined from Carpenter 158 steel for increased strength, includes 4140 Carbon steel
(Tool Steel) machined extractor and ejector, extractor spring.
***This Nickel Boron BCG is POLISHED Nickel Boron, not the less expensive MATTE finish. Polished Nickel boron provides less friction and wear than matte during cycling.***
- Carpenter 158 steel bolt
- 8620 Carrier
- Nickel Boron Carrier (AUTO)
- Nickel Boron Gas Key
- Gas Key Hardened to USGI Specifications
- Grade 8 Hardened Fasteners
- Key Staked Per Mil-Spec
- 4140 Carbon Steel (Tool Steel) Extractor
- Extractor Spring
- Extractor Insert
- USE FOR THE FOLLOWING CHAMBER/AMMUNITION 5.56 NATO, .223 REMINGTON, .223 WYLDE, 300 BLACKOUT AND 204 RUGER
Written by Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), Chief of the Firearms Technology Branch
...M16 bolt carriers are not designed and intended solely and exclusively for use in converting a weapon into a machinegun and are not any combination of parts from which a machinegun can be assembled. Further, an M16 bolt carrier is not
a firearm as defined in the GCA or a machinegun as defined in the NFA.
An M16 bolt carrier is simply a machinegun part and as such its
domestic sale and possession is unregulated under the Federal firearms laws. It is not unlawful to utilize a M16 machinegun bolt carrier in a semiautomatic AR15 type rifle.