This BCA AR-15 complete .223 Wylde rifle length upper has a 18″ Black Wolf fluted heavy barrel with a black nitride 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 BCA bolt carrier group, a flash hider, and a gen 2 right side charging handle. This .223 Wylde upper is compatible with any mil-spec AR-15 lower. This has the new handguard.