NBS AR-10 / 308 / 6.5 Creedmoor Bolt Carrier Group - Phosphate + Chrome-Lined

This Phosphate .308 Complete BCG is compatible with any AR10, .308 or 7.62x51 rifle that follows the DPMS pattern. The bolt is (MPI) certified. Bolt: MPI Inspected 9310 Alloy Steel Hardened Steel Extractor Milspec Gas rings (3) Black Extractor Insert Shot-Peened, MPI bolt Bolt Carrier: 8620 steel Heavy Duty Full Cut Design Grade 8 Gas Key Screws, Staked Gas Key Material - 4140 Chrome-lined Carrier and Gas Key Cam Pin: 8620 Steel Firing Pin: Mil-Spec Firing Pin