AR15 6MM ARC 24" Upper Receiver ARC 6MM AR15 Upper (3)

This AR-15 complete 6mm Arc upper has a 24" heavy contour barrel with a 416R stainless finish, and features a 1:8 twist rate, with a rifle length gas system. It includes a 15" MLOK rail, an M4 flat-top billet upper receiver, a bolt carrier group, a flash hider, and a right-side charging handle (Gen 2) (patent protected). This 6mm Arc upper is compatible with any mil-spec AR-15 lower.