AR15 4.5" Side Charging 556 NATO Complete Upper

AR15 4.5" Upper Receiver 5.56 This AR-15 complete 5.56 NATO upper features a 4.5" heavy barrel with a parkerized finish, a 1:7 twist rate, and a right-side charging handle. It includes an MLOK split rail, a micro flash hider, a bolt carrier group, and a right-side charging upper receiver. This 5.56 NATO upper is compatible with any mil-spec AR-15 lower.