SALE! AR15 6MM Arc 18" Upper Receiver

This AR-15 complete 6mm Arc upper has a 18" heavy contour barrel with a parkerized finish, and features a 1:8 twist rate, with a mid length gas system. It includes a 15" MLOK rail, an M4 flat-top forged upper receiver, a bolt carrier group, a flash hider, and a rear charging handle. This 6mm Arc upper is compatible with any mil-spec AR-15 lower.