Sons of Liberty Gun Works Bolt Carrier Group The Sons of Liberty Gun Works Bolt Carrier Group features an M16 profile and is tested to ensure a lifetime of reliability. Bolt: Precision machined from Carpenter Technology No. 158 alloy, Heat treated per mil-spec, Shot peened per ASTM B851/SAE AMS2430S, Vibratory tumbled Individual high pressure/proof (HP) Full Auto test fired as an 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 (all 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 qualty 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 all 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 Click here to browse our entire selection of Bolt Carrier Groups & Parts.
