Sons of Liberty understands the importance of the bolt carrier in an AR15 Platform rifle, so they tailored their BCGs around durability, reliability and consistency, while avoiding adding gimmicky “features” or coatings. All SOLGW Bolt Carrier Groups are SP/HPT/MPI. Each individual BCG is test-fired by SOLGW before they are sent out the door.
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
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
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
Gas Key:
Machined from 4130 Chromoly steel alloy per ASTM A108/A322-13
Heat-treated; hard chrome internal
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
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
Made in USA.
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