ships tomorrow.BCM Bolt Carrier Group (MPI) – Auto
Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and chrome-lined inside carrier. Machined to USGI specifications. This M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome-lined and heat-treated per GI specifications. Gas key is secured to the carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts ensure a strong staking and proper gas system functioning.
The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength, includes a tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).
All BCM Bolt Carrier Groups are test-fired for function prior to shipping. As such, the Bolt Carrier Group will show handling marks consistent with these quality control procedures.
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