This AR-15 complete 5.56 NATO rifle length upper has a 16" M4 contour barrel with a parkerized finish, and features a 1:7 twist rate, with a carbine length gas system. It includes a 15 1/4" MLOK rail, an M4 flat-top billet 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 has the new handguard.
