This AR-15 complete 5.56 Nato rifle length upper has a 16" M4 contour barrel with a 416R stainless steel finish, and features a 1:8 twist rate, with a carbine length gas system. It includes a 15" MLOK rail, an M4 flat-top 7075 billet aluminum upper receiver, a bolt carrier group, a flash hider, and a rear charging handle. This 5.56 Nato upper is compatible with any mil-spec AR-15 lower. This Slick Side 5.56 NATO upper has no forward assist or dust cover.
