Description M16 profile 5.56/223/300BLK Nitrided throughout assembly, including carrier and key 9310 Bolt MPI Tested Shot Peened Mil-Spec Tool Steel Extractor w/ Crane (NAVSPECWAR) o-ring & spring Mil-Spec Staking on the Keys 100% Made in the USA H&M Black Nitride plating for a deep, smooth black nitride finish
