Daniel Defense M16 Cut Complete AR-15 Bolt Carrier Group

JP Enterprises FMOS Full Mass Bolt Carrier Group .223 Remington, Black

JP Enterprises Full Mass Operating System Bolt Carrier .308 Win, Black

ONE HORSE M16 Nickel Boron Bolt Carrier Group 5.56/300 BO

DANIEL DEFENSE 5.56mm HP & MPI Tested Complete Bolt Carrier Group (04-013-19032)

JP Enterprises FMOS Enhanced High Pressure Bolt Carrier Group .308 Win, Black

ONE HORSE M16 Nitride Bolt Carrier Group 5.56/300 BLK

Superlative Arms Full-Auto Direct Impingement Bolt Carrier, Black