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AIM 5.56/.223 AR Bolt Carrier Group w/ Carpenter 158 MPI Bolt and 8620 Carrier. AIM AR/M16 .223/5.56 complete Bolt Carrier Groups. We are having these bolts manufactured to our exacting standards. Features a Military Spec. Carpenter 158 Tool Steel Bolt; 8620 Chrome lined 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. MPI and C158 Marked. from AIM Surplus (Product XAIMBCG158)

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