Sons of Liberty Gun Works - 5.56 158 Carpenter BCG - #SOLGWBCG556

If you're building an AR-15 meant to endure harsh conditions and perform beyond Mil-Spec standards, the Sons of Liberty Gun Works (SOLGW) Bolt Carrier Group is the go-to choice. Engineered with precision and purpose, every component in this BCG is heat treated, high pressure tested (HPT), and magnetic particle inspected (MPI) to ensure unmatched durability and long-term performance.

The carrier is machined from AISI 8620 aircraft-grade steel with a full-auto profile and finished in manganese phosphate for superior corrosion resistance. The bolt is crafted from Carpenter 158 steel, shot peened for added strength, and tested to run reliably under extreme conditions.

Every piece of the BCG serves a critical function—and SOLGW ensures each part is built to the highest standards to minimize the chance of failure. The gas key, made from 4130 chromoly steel, is properly staked with Grade 8 hex screws for a secure, long-lasting fit.

• Bolt: Carpenter 158 steel, HPT/MPI tested, shot peened
• Extractor: 4340 tool steel, shot peened
• Ejector: S7 tool steel, shot peened
• Carrier: 8620 steel with full-auto profile, manganese phosphate finish
• Gas Key: 4130 chromoly steel with chrome lining and staked Grade 8 hex screws
• Cam Pin: 4340 chromoly steel with solid film lubricant
• Firing Pin: 8640 steel alloy, hard chrome plated
• Gas Key Bore: Precision ground interface for tight, consistent fit

With thoughtful enhancements like a precision-ground gas key interface and wear-reducing cam pin coating, this BCG is designed to keep your AR-15 running smoothly, shot after shot. Even the firing pin is chrome-plated for extended service life.