Aero Precision .308 Winchester Bolt Carrier Group

The Aero Precision .308 Winchester Bolt Carrier Group delivers reliable performance for large-caliber AR-10 builds, engineered to meet the demands of precision shooting and heavy-duty use.

What you get

• Mil-spec phosphate finish for corrosion resistance
• MPI/HPT tested for durability and reliability
• Carrier made from 8620 tool steel, bolt from case-hardened 9310 steel
• Gas key constructed from 4130 steel, attached with Grade 8 hardware and properly staked
• Forward assist serrations for smooth operation
• Laser-engraved Aero Precision ‘A’ logo
• Firing pin made from 8740 steel with hard chrome coating
• Extractor crafted from 4340 steel

Build and finish

The Aero Precision .308 Bolt Carrier Group is designed for precision and longevity. The carrier is machined from 8620 tool steel, known for its toughness and ability to withstand high-stress conditions. The bolt, made from case-hardened 9310 steel, undergoes shot peening to enhance its fatigue resistance, ensuring consistent performance under repeated firing cycles.

The mil-spec phosphate finish provides a durable surface that resists corrosion and wear, making it suitable for harsh environments. The gas key, constructed from 4130 steel, is securely attached with Grade 8 hardware and properly staked to prevent loosening over time. The firing pin, coated with hard chrome, ensures smooth operation and reduces friction, contributing to the overall reliability of the BCG.

Compatible platforms

• AR-10 rifles and uppers chambered in .308 Winchester/7.62x51mm NATO
• Large-frame AR platforms designed for .308 compatibility

Installation notes

Installing the Aero Precision .308 Bolt Carrier Group is straightforward for anyone familiar with AR platform assembly. Simply ensure proper alignment with the upper receiver and verify that the gas key and bolt move freely without obstruction. A light application of lubricant is recommended before initial use.

For builders focusing on Polymer80 frame assemblies and modular pistol parts, this BCG complements larger-caliber projects, offering a reliable foundation for AR-10 builds. Its precision engineering and robust construction make it a dependable choice for shooters who demand performance and durability in their firearms.