This BCA AR-15 complete .300 Blackout pistol length upper has a 7.5" heavy barrel with a parkerized finish, and features a 1:8 twist rate, with a pistol length gas system. It includes a 7 5/16" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This .300 Blackout upper is compatible with any mil-spec AR-15 lower.
