Deal**Special run of Aero Precision nickel boron bolt carrier groups with laser etched logo**The Aero Precision upgraded nickel boron bolt carrier group is an eye catching addition to your AR build. Mil-spec dimensions and coating ensure the highest quality and correct component interface. Features: Machined from 8620 tool steel (M16/Auto Carrier) and 9310 Carpenter Steel (Bolt) Shrouded firing pin Nickel boron coating inside and out (Bolt, Carrier, and Gas Key) Forged Mil-Spec gas key attached with Grade 8 hardware and properly staked. 5.56 Bolt is shot peened and High Pressure Tested / Magnetic Particle Inspected 5.56 Bolt is marked "ST HPT/MPI" Mil-Spec extractor spring, black extractor insert, Viton O-Ring Tool steel extractor High quality nickel boron BCG made in USA. from Granite Ridge Outfitters (Product APRH100291) |