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Toolcraft .223/5.56/300 BLK M16 Profile Bolt Carrier Group - Black Nitride
The Toolcraft 5.56x45/.223/.300BO M16 Profile MPI Inspected Bolt Carrier Groups features a Black Nitride finish, 8620 Steel Bolt Carrier, 9310 Steel Bolt, Mil-Spec chromed firing pins, Mil-Spec gas keys with Grade-8 staked screws that are sealed w/ Permatex No.3, and shot-peened case-hardened D2...