Sons of Liberty looks at the bolt carrier group as the heart of the gun. If the gas port is the lungs, then the bolt carrier group is the heart. It’s what drives the entire gun. If you look at the AR platform’s cycle of operations, everything happens around the bolt carrier group. Locking, unlocking, extracting, ejecting…all of it begins with the bolt carrier group.
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.
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
