BCM Rifle Company.
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BCM® Bolt Carrier Group.
Full Auto Carrier. Full Auto Carrier.
The BCM® Bolt Carrier Group features a parkerized exterior and chrome lined inside carrier, machined to support automatic fire and properly hardened parts to insure a strong staking and proper gas system functioning.

Works in any AR15, M16, or M4

Full Auto Carrier.
The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength. Also includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).
 
Bolt Assembly.
Machined to USGI specifications, this M16/M4 carrier includes the proper Mil-Spec gas key. The gas key is chrome lined and heat treated, per GI specifications, secured to the carrier via USGI domestic manufacturing Grade 8 fasteners and properly staked per Military Specifications.
BCM Rifle Company Specifications.