AR-15/M16 Bolt Assembly HPT/MPI Carpenter 158 Steel | SOLGW

Manufactured to precise tolerances, these high-quality replacement parts help keep your AR-15 functioning properly.  This bolt assembly from SOLGW will work with any AR-15.

Sons of Liberty Gun Works Bolt Carrier Group HPT/MPI
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

Priced individually.

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