Tacfire AR15 / M16 Mil-Spec Bolt Carrier Group Assembly .223/5.56 - Nickel Boron - Made In U.S.A. BCG-NIB - Premium Grade

NiB Bolt Carrier Group Assembly Is Made In The U.S.A.\n\nCarrier\n- M16 style (Auto)\n- Machined from 8620 tool steel\n- Heat treated to mil spec\n\nBolt\n- Machined from 9310 tool steel\n- Heat treated to military specifications\n- Shot Peened\n- MPI (Mag Particle Inspected)\n\nGas Key\n- Machined from 17-4 Stainless Steel\n- Heat treated to mil spec\n\nExtractor\n- Machined from S-7 shock resisting tool steel\n- Heat treated to mil spec\n- Shot peened\n- Extractor spring is made of stainless steel music wire\n\nFiring Pin\n- Machined from 17-4 stainless steel\n- Heat treated to milspec