The BCM® (MPI) complete bolt carrier group is fully assembled and ready for your AR-15, M16, or M4 platform. This auto version BCG features a Parkerized exterior with a chrome-lined interior, machined to strict USGI specifications. The M16/M4 carrier includes a properly Mil-Spec gas key that is chrome-lined, heat-treated per GI standards, and secured with USGI Grade 8 fasteners that are properly staked to ensure reliable gas system performance.
The bolt assembly is crafted from Mil-Spec Carpenter No. 158® steel and shot peened for added strength. It includes a tool steel machined extractor and ejector, a BCM Extractor Spring, and undergoes both HPT (High Pressure Testing) and MPI (Magnetic Particle Inspection). All BCM Bolt Carrier Groups are test fired for function before shipping, so handling marks may be present from quality control procedures.
The Flat Dark Earth version includes an Ion Bond-coated stripped carrier for reduced friction and easier cleaning.
Restricted Part: Please check with your state regulations for ownership of Restricted Parts. May require documentation.
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