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. Carrier M16 style (Auto) Machined from 8620 tool steel Heat treated to mil spec Bolt Machined from 9310 tool steel Heat treated to military specifications Shot Peened MPI (Mag Particle Inspected) Gas Key Machined from 17-4 Stainless Steel Heat treated to mil spec Extractor Machined from S-7 shock resisting tool steel Heat treated to mil spec Shot peened Extractor spring is made of stainless steel music wire Firing Pin Machined from 17-4 stainless steel Heat treated to milspec