AR15 .450 Bushmaster 18" Upper Receiver Bushmaster .450 AR15 Upper (7)

This AR-15 complete .450 Bushmaster rifle length upper has a 18" heavy barrel with a parkerized finish, and features a 1:24 twist rate, with a mid-length gas system. It includes the new 15" MLOK rail, an M4 flat-top forged upper receiver, a bolt carrier group, a flash hider, and a rear charging handle, and the Muzzle Brake. This .450 Bushmaster upper is compatible with any mil-spec AR-15 lower.