AR15 .450 Bushmaster 18" Upper Receiver Bushmaster .450 AR15 Upper (6)

This AR-15 complete .450 Bushmaster Bolt Action Style rifle length upper has a 18" heavy barrel with a parkerized finish, and features a 1:24 twist rate. It includes a 15" MLOK rail, an M4 flat-top billet upper receiver, a bolt carrier group, the custom muzzle brake, and a right-side bolt action style charger. This 450 Bushmaster upper is compatible with any mil-spec AR-15 lower.