450 Bushmaster bolt carrier group.
Carrier: SAE 8620, Heat Treated, Nitride Coated
Bolt: Carpenter 158, Shot Peened, Heat Treated, Nitride Coated
Firing Pin: Heat Treated, Precision ground
Gas Key: Heat Treated, Chrome Lined, Torqued and Staked to Carrier, Nitride Coated
Cam Pin: Heat Treated, Nitride Coated
