WMD 5.56 AR-15 Bolt Carrier Group Without Hammer - NiB-X Finish

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

FailZero M16/M4 Bolt Carrier Group, No Hammer, EXO Nickel Boron Coated, Black Finish FZ-M16/4-01-NH-BLACK

FailZero M16/M4 Bolt Carrier Group, No Hammer, EXO Nickel Boron Coated, Matte Finish FZ-M164-01-NH-MATTE

FAILZERO AR15 5.56mm Exo Nickel Bolt Carrier Group with Hammer (FZ009-FZAR15-01)

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

FailZero Bolt Carrier Group With Hammer, Completely Assembled, EXO Coated, Fits M16/4, Nickel Finish FZ-M164-01-SAH

DMA Inc. XTS AR-15 .223 / 5.56 Anodized Bolt Carrier Group-Red