Bravo Company Bolt Carrier Group, Black

The BCM (MPI) complete bolt carrier group is a high-performance component for AR-15, M16 or M4 firearms. Features a fully-assembled auto-version bolt carrier group with a Parkerized exterior and chrome-lined interior for durability and smooth operation. Precision machined to USGI specifications, the M16/M4 carrier includes a mil-spec gas key that is chrome-lined and heat treated to GI standards. The gas key is securely attached with USGI domestic manufacturing grade 8 fasteners and properly stak