AR/M16 .223/5.56 complete Nickel Boron Bolt Carrier Groups. Features 9310 Bolt Material; 8620 carrier and gas key; Properly staked Investment cast gas key hardened to USGI specifications fastened with Hardened Grade 8 Fasteners; Shot peened MPI (Magnetic Particle Inspected) Bolt. Extractor O-Ring upgrade with Black Insert.
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