Sons of Liberty - 5.56 Full Auto Bolt Carrier Group

Built for serious shooters and duty-grade reliability, the Sons of Liberty Gun Works (SOLGW) 5.56 Bolt Carrier Group is one of the most rigorously tested and precision-machined BCGs on the market today. Every critical component is made from premium materials, individually tested, and finished to exceed military standards—offering unmatched performance and peace of mind for those who demand the best.

Key Features:

• Carpenter 158 Bolt: Precision machined, heat-treated, shot-peened, HP tested, and MPI inspected—deep laser engraved with SP/HP/MP markings.
• Full Auto Profile Carrier: Machined from aircraft-grade 8620 alloy, hard chrome lined, carburized, strain relieved, and phosphate coated. Gas key torqued/staked per mil-spec.
• Upgraded Extractor Assembly: 4340 tool steel extractor, S7 tool steel pin, Sprinco 5-coil spring, black insert, and elastomer buffer for extreme reliability.
• Durable Internal Components: S7 ejector, stainless gas rings, 8640 chrome-plated firing pin, and a phosphate-coated 1038 steel retaining pin.
• Battle-Tested Assembly: Individually high-pressure tested, full-auto test fired, and magnetic particle inspected to ensure flawless function under stress.
• Finish and Marking: Manganese phosphate finish throughout with deep laser-engraved Sons of Liberty Battle Flag logo.

Material & Process Breakdown:

• Bolt: Carpenter 158, HP/MPI/SP, heat treated, vibratory tumbled
• Carrier: AISI 8620, full-auto profile, chrome-lined, phosphate finish
• Gas Key: 4130 Chromoly steel, chrome-lined, Grade 8 hardware, staked & sealed
• Extractor: 4340 steel, Sprinco 5-coil spring, cryo-treated, black insert
• Ejector: S7 tool steel, phosphate coated
• Cam Pin: 4340 Chromoly steel with mil-spec solid film lubricant
• Firing Pin: 8640 steel, hard chrome plated
• Retaining Pin: 1038 steel, phosphate coated

Compatible With:

• All AR-15 platforms chambered in 5.56/.223
• Mil-Spec upper receivers

Why Choose SOLGW:

• Made in the USA
• Meets or exceeds all MIL-SPEC standards
• Trusted by professionals, law enforcement, and serious shooters