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.223/5.56 NATO mil-std phosphate full auto carrier. Made from 8620 steel with chrome lined bore and gas key. Bolt is Carpenter 158 steel.
Can be used legally in most semi-automatic rifles.
.223/5.56 NATO MPI Nickel Boron AR-15 Bolt Carrier Group (BCG)
Features: Nickel Boron Finish, M16 cut, 8620 steel carrier, Carpenter 158 steel bolt.
.223/5.56 NATO salt-bath nitride coated full auto carrier. Made from 8620 steel. Bolt is Carpenter 158 steel.
