This AR-15 Complete 5.56 rifle length upper has a 16" M4 with a parkerized finish, and features a 1:7 twist, with a mid-length gas system. It includes a 15 1/4" MLOK rail, a M4 flat-top billet upper receiver, a bolt carrier group, flash hider, and a charging handle. This 5.56 upper is compatible with any mil-spec AR-15 lower.
