SOLGW Bolt Carrier Group 5.56/300BLK Carpenter 158 SP/HPT/MPI

SONS OF LIBERTY BOLT CARRIER GROUP: Best Bolt Carrier in the industry! Bolt: Precision machined from Carpenter Technology No. 158 chrome-nickel alloy Heat treated per mil-spec, Shot peened per ASTM B851/SAE AMS2430S, Vibratory tumbled Individual high pressure/proof (HP) test Full Auto test fired at assembly Individual magnetic particle inspection ASTM E1444/E1444M (MP) Markings deep laser engraved (SP=Shot Peened, HP=High Pressure Tested, MP=Magnetic Particle Inspection.) Extractor: Precision machined from 4340 tool steel alloy per SAE AMS6415T/AMS6484D (vs 4140) Heat treated Shot peen per ASTM B851/SAE AMS2430S Extractor Retaining Pin: Precision machined and ground S7 Tool Steel Heat treated per ASTM A681-08 Shot peened per mil-spec print Manganese phosphate Extractor Spring: Tactical Springs/Sprinco 5 coil, ASTM Grade A401 Chrome Silicon wire stock Heat treated Stress relieved, Molybdenum-Disulfide infused Cryogenic processed (Hidden post winding) Mil-spec black insert/synthetic elastomer extractor buffer (nitrile-butadiene, shore hardness 80 /-5 durometer per MIL-PRF-6855) Ejector: S7 Tool Steel Heat treated per ASTM A681-08 Shot peened per Mil-Spec Manganese phosphate Ejector Spring: Heat treated Mil Spec Gas Rings: Standard stainless steel per Mil-Spec X3 Carrier: Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13 Full auto profile Heat-treated Carburized/strain relieved, hard chrome bore Precision ground gas key interface Sons of Liberty Battle Flag logo deep laser engraved Manganese phosphate Gas Key: Machined from 4130 Chromoly steel alloy per ASTM A108/A322-13 Heat-treated; hard chrome internal Manganese phosphate Permatex sealed Grade 8 hex screws torqued and staked Hidden per mil-spec Cam Pin: Precision machined 4340 Chromoly steel alloy per SAE AMS6415T/AMS6484D Heat-treated/processed per mil-spec Manganese phosphate Solid film lubricant applied and cured per mil-spec Firing Pin: Precision machined 8640 steel alloy Heat treated/processed per mil-spec Hard chrome plate Firing Pin Retaining Pin: Precision machined from 1038 carbon steel Heat-treated/processed per mil-spec Manganese phosphate Find out why this is the Best Bolt Carrier Group in the industry. Son’s Of Liberty Gun Works