BCA M16 Profile 5.56 NATO Complete Bolt Carrier Group - Black Nitride
This?Bear Creek Arsenal BCG features a full mass M16 profile bolt carrier machined from 8620 steel and?finished with Salt Bath Nitriding. The gas key is properly staked and the carrier does have forward assist serrations. The 5.56 NATO bolt assembly is made of 9310 steel and features a manganese phosphate finish. Every BCG goes through magnetic particle inspection (MPI).