AIM NiB Bolt Carrier Group, 5.56MM/300AAC
AIM AR/M16 5.56/.223/.300 BLACKOUT complete Nickel Boron Bolt Carrier Groups. These bolts manufactured to our exacting standards with 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 insert installed.
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