Lantac M-SPEC BCG .308/7.62 NiB

JP Enterprises Enhanced Bolt Assembly Completion Group .308 Win, Black

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

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

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

AERO PRECISION AR15 5.56 Pro Series Bolt Carrier Group - Black Ni

BATTLE ARMS Enhanced Bolt Carrier Group AR15/M16 Black

NOVESKE 5.56/300BLK DLC Enhanced Bolt Carrier Group with Packaging (5002854)