This M16 bolt carrier group is laser engraved with the Spike's Tactical spider logo (visable through the ejection port door opening). Mil-Spec tool steel carrier (with shrouded firing pin) and carrier key are given a phosphate finish inside and out with a hard chrome bore. The carrier key is attached with Grade 8 hardware and properly staked. The bolt is CNC machined from Carpenter 158 steel, shot peened, high pressure tested (HPT), magnetic particle inspected tested (MPI) and given a phosphate finish inside and out. Tool steel extractor is shot peened and fitted with a Mil-Spec black extractor spring insert and Viton o-ring. Mil-Spec firing pin receives a hard chrome finish. Mil-Spec cam pin and retaining pin are given a phosphate finish. MADE IN THE U.S.A.