The Rubber City Armory 9mm Bolt Carrier Group is purpose built for AR-15 pistol caliber carbines that utilize Colt or Glock style magazines. This 9mm BCG features a removable weight and is full auto compatible. The AR-15 style extractor is machined from a billet of steel for improved reliability and durability while the stainless steel firing pin utilizes a standard cotter pin for ease of disassembly. The RCA 9mm BCG also features an integral carrier key for the charging handle to interface with. To top it off, it features a Blacknitride+ coating to improve the hardness and smoothness of the surface making it reliable and easy to clean. Check out the Rubber City Armory 9mm BCG for your next premium PCC.Features: Blacknitride+ coating 8620 steel carrier Tool steel AR-15 style extractor Integral carrier key Compatible with Glock and Colt mags Removable weight Stainless steel firing pin