Run your rifle with confidence using this reliable M16 bolt carrier group. Built for 5.56/.223 and .300 Blackout, it delivers smooth cycling, consistent extraction, and dependable performance in any setup. The full nitride finish adds durability, corrosion resistance, and easy maintenance, all backed by Mil-Spec construction and a properly staked gas key. A simple, rugged upgrade for any AR15 build. 9310 Tool Steel Bolt 8620 AQ Steel Carrier Full MIL-SPEC Heat Treatment Magnetic Particle Inspection (MPI) Back of Lugs Chamfered for Reliability Spring, Insert, & O-Ring Installed on Bolt Extractor Salt Bath Nitrided Bolt, Carrier & Cam Pin S7 Extractor Staked Gas Key with Grade 8 Fasteners Full Auto Compatible Forward Assist Serrations All USA Materials and Manufacturing