Spikes Tactical .223 Rem/5.56 Bolt Carrier Group, Nickel Boron - ST5BG03

Your bolt carrier group is one of the most critical parts of your build. Don't buy an imitation. This is the same BCG we use on our builds.Features:Complete nickel boron-plated M-16 BCGNickel boron coating inside and out (bolt, carrier, and gas key)Laser engraved with ST Spider logoMil-Spec carrier - 8620 tool steel, full auto M-16Bolt- 158 carpenter steel, shot peened, high pressure tested (HPT), magnetic particle inspected (MPI)Mil-Spec extractor - 8620 tool steel, nickel boron finish, extractor spring, black extractor inser and Viton O-ringMil-Spec gas key - 8620 tool steel, grade 8 hardware, properly stakedFiring pin with hard chrome finishCam pin nickel boron finishRetaining pin