TacFire AR Solutions 5.56mm NATO Bolt Carrier Group - Established in 2010,TacFire offers an extensive line of sporting good products ranging from riflescopes, red dots, flashlights, Iron sights, Mounts and much more accessories. They serve the needs of their consumers by offering their wide variety of accessories for many different firearm platforms. AR-15 Mil-Spec Bolt Carrier Group Assembly is made in the U.S.A. Precision machined 9310 heat treated steel with a corrosion resistant black nitride finish. Full-auto capacity, shot peened MPI Bolt, 8620 gas carrier & gas key fastened with hardened Grade eight fastners. Bolt: 9130 Steel Carrier: 8620 Steel Mpi Tested And Shot Peened Length: 7.5" Weight: 11.7 Oz. Finish: Nitride Made In The USA