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M16 BOLT CARRIER GROUP. 8620 STEEL CARRIER CHROME LINED. 9310 STEEL BOLT SHOT PEENED AND INDIVIDUALLY MPI TESTED. CHROME LINED GAS KEY PROPERLY STAKED WITH GRADE 8 FASTENERS. CAM PIN, FIRING PIN, AND FIRING PIN RETAINING PIN. STANDARD MIL-SPEC 7075-T6 ALU
