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NBS .223/5.56/300 BLK Complete Bolt Carrier Group – Nickel Boron
Dirty Bird Industries Enhanced Bolt Carrier Group .223/5.56
Toolcraft .223/5.56/300 BLK M16 Profile Bolt Carrier Group – Nickel Boron
Microbest C158 HPT/MPI 5.56 Bolt Carrier Group – Black Nitride
One Horse M16 .223/5.56 Bolt Carrier Group – Black Nitride
Rubber City Armory Lightweight AR-15 Titanium BCG w/ Adjustable Gas Key
Rubber City Armory Lightweight AR-15 Titanium BCG
RISE Armament RA-1010 Low-Mass .223/5.56 Bolt Carrier Group – Nickel Boron