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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
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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).
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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.
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