One Horse M16 5.56/.300 BLK BCG Nickel Boron - Bolt Carrier Group

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

ONE HORSE M16 Nitride Bolt Carrier Group 5.56/300 BLK

FRANKLIN ARMORY Bolt Carrier Group 5.56 x 45mm Black

FailZero M16/M4 Bolt Carrier Group, No Hammer, Black Nitride Coated, Black Finish FZ-NITRIDE-01-NH

DMA Inc. XTS AR-15 .223 / 5.56 Mil-Spec Bolt Carrier Group - Nickel Boron

LBE Unlimited 556 Bolt Carrier Group, Nickel Boron Coated M16BCG-NIB

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