Looking to add a little extra flair to your AR build? Check out the Aero Precision 5.56 Nickel Boron Bolt Carrier Group. This BCG is machined from 8620 tool steel and features a nickel boron coating that is sure to make your gun stand out from the rest. The forward assist serrations and shrouded firing pin give this BCG a high-end look, while the mil-spec dimensions and coating ensure correct component interface and the highest quality possible. The 5.56 bolt is shot peened and MPI, and the extractor spring, black extractor insert, and Viton O-Ring provide reliable extraction. This is a high quality BCG that is proudly made in the USA.