Upgrade your rifle with this dependable 16a ^2 5.56 NATO complete upper receiver. Built for accuracy and smooth performance it features a 16a ^2 HBAR profile barrel with a 1:8 twist rate delivering excellent rigidity heat resistance and consistent shot-to-shot accuracy. The free-float 15a ^2 M-Lok handguard provides solid accessory mounting and improved barrel stability.The nitride-finished bolt carrier group ensures reliable cycling and long-lasting durability with minimal maintenance while the full-length Picatinny rail offers ample space for optics and accessories. Ready to pin onto any Mil-Spec AR-15 lower this upper is built in the U.S.A. and ready for work.Includes:16a ^2 5.56 NATO HBAR barrel (1:8 twist)15a ^2 M-Lok free-float handguardNitride BCGCharging handleClamp-on system with steel barrel nut and screwsReliable modular and ready to run.