The White Label Armory M16 Bolt Carrier Group in 5.56 NATO is engineered for unmatched reliability and premium performance. Featuring a precision-ground carrier machined from 8620 steel and treated with H&M's Blacknitride+ finish, this BCG delivers exceptional surface hardness, corrosion resistance, and smooth operation. The 9310 steel bolt is shot peened, heat treated, and MPI tested for maximum strength and durability. Additional performance-optimized components include a billet 4130 steel gas key, hardened 4140 cam pin and extractor, and a heat-treated 8640 steel firing pin. Designed to exceed mil-spec standards, this full-auto-compatible BCG is 100 percent American made and built to perform across thousands of rounds.