This AR-15 complete 6mm Arc upper has a 16" M4 contour barrel with a 416R stainless finish, and features a 1:8 twist rate, with a mid 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.
BCG Included
