Brownells BRN AR-15/M16 5.56 NATO Bolt Carrier Group MPI Nickel Boron

The Brownells BRN AR-15/M16 Bolt Carrier Group is chambered for 5.56mm NATO and features a durable nickel boron finish for enhanced corrosion resistance, smoother cycling, and easier cleaning. Magnetic Particle Inspected (MPI) for quality assurance, this BCG is compatible with standard AR-15 and M16 platform rifles. The nickel boron coating reduces friction and buildup, making it an excellent upgrade or replacement for mil-spec AR builds.