Aero Precision .308 Winchester Bolt Carrier Group

Shop for M5 308 Bolt Carrier Groups at Aero Precision. Our BCGs are HPT/MPI and are the perfect firing mechanize for your next large caliber AR 10 build.

Aero Precision 308 Phosphate Bolt Carrier Group

Our .308 / 7.62 Bolt Carrier Group is an excellent choice for your big-bore rifle build. This high-quality BCG has a mil-spec phosphate finish, is MPI/HPT tested, and now features a laser-engraved Aero Precision ‘A’ logo!

Carrier Features:

• Made from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt)
• Finish: Mil-spec phosphate coating
• Gas Key: Made from 4130 Steel, attached with Grade 8 hardware, and properly staked
• Firing Pin: Made from 8740 steel and hard chrome coated
• Forward assist serrations
• Laser-engraved Aero Precision logo
• Fits AR .308 compatible uppers and rifles

Bolt Features:

• Material: Case-hardened 9310 Steel
• Finish: All bolt parts are shot peened and phosphate coated
• Extractor: Made from 4340 Steel with double O-rings and double springs
• Magnetic Particle Inspected and High Pressure Tested
• High-pressure bolt – external surfaces are CNC ground after heat treatment for a precise fit, and the firing pin hole diameter is reduced to .070″
• Multi-caliber bolt designed to work with .308, 7.62×51, .338 Federal, and other .308-based cartridges.

Includes:

• Bolt carrier
• Complete bolt
• Firing pin
• Cam pin
• Retaining pin