AR15 BCG- .224 Valkyrie / 6.8 SPC, Nitride

AR-15 BCG for 224 Valkyrie and 6.8 SPC in Nitride finish. M16 Auto Profile Carrier machined from aircraft/bearing quality 8620 steel, properly heat treated, ground to perfection, Black Nitride finish by H&M. Bolt machined from a single piece aircraft/bearing quality 9310 steel, heat treated properly, precision ground, shot peened and MPI'd. Firing pin machined to mil-spec from 8740, precision ground, and chrome plated. One piece billet fully machined enhanced extractor, phosphate coated for increased reliability and corrosion resistance. Nitride cam pin. S7 tool steel ejector and extractor retaining pin. 4130 gas key, nitride, precision staked using our hydraulic staking machine. KAK carrier key screws - T25 drive, Grade 8, properly heat treated.