AIM AR/M16 H4 .223/5.56 Nitride 9310 MPI Bolt Carrier Group. A newly designed carrier reduces the surface area contact between the carrier and receiver walls. This improves performance and reliability.
Bootleg 5.56 Assembled Nitride Bolt Carrier Group feature a matte Black Nitride finish. Complete Mil-Spec Assembly with Bolt, Bolt Carrier, and Firing Pin ready to drop into the AR upper of your choice.