Aero Precision .308 Winchester Bolt Carrier Group

About this product

The Aero Precision .308 Winchester Bolt Carrier Group delivers reliable performance for large-caliber AR-10 builds, combining precision engineering with durable materials for consistent operation under demanding conditions.

What you get

• HPT/MPI tested bolt carrier group for reliability
• Mil-spec phosphate finish for corrosion resistance
• Laser-engraved Aero Precision ‘A’ logo
• Forward assist serrations for compatibility with standard AR platforms
• Properly staked gas key made from 4130 steel
• Hard chrome-coated firing pin for smooth operation

Build and finish

Constructed from 8620 tool steel for the carrier and case-hardened 9310 steel for the bolt, this BCG offers exceptional strength and durability. The phosphate finish ensures long-lasting corrosion resistance, while the shot-peened bolt components enhance fatigue resistance under high-pressure loads.

The gas key, made from 4130 steel and secured with Grade 8 hardware, is staked to withstand the rigors of sustained fire. The extractor, crafted from 4340 steel, provides reliable cartridge extraction even in adverse conditions.

Hard chrome coating on the firing pin reduces friction and wear, ensuring smoother cycling and extended service life.

Compatible platforms

• AR-10 rifles
• .308 Winchester-compatible uppers
• 7.62 NATO platforms
• Other large-caliber AR-style builds

Installation notes

This bolt carrier group is designed for straightforward installation in compatible AR-10 platforms. Ensure proper alignment of the gas key with the gas tube during assembly, and verify headspace before use.

For builders working on Polymer80 frame projects or modular pistol builds, pairing this BCG with a compatible upper receiver ensures a reliable foundation for larger-caliber applications. Its precision tolerances and robust construction make it a dependable choice for both custom builds and upgrades.