Upgrade your rifle with this dependable 16a ^2 5.56 NATO complete upper receiver. Built for accuracy and smooth performance, it features a free-float 15a ^2 M-Lok handguard for solid accessory mounting and improved barrel stability. The nitride BCG delivers reliable cycling and low-maintenance durability, while the full-length Picatinny rail gives you plenty of room for optics. Ready to pin onto any Mil-Spec lower, this upper is built in the U.S.A. and ready for work. Includes: 16a ^2 5.56 NATO barrel (1:8 twist), 15a ^2 M-Lok free-float handguard, nitride BCG, charging handle, clamp-on system with steel barrel nut and screws. Reliable, modular, and ready to run.