Not sure what you mean by screw on muzzle brake. But don't get those cheap ons held in place by an Allen wrench screw. Guy I know had one last about 2 rounds, and it left his barrel at a high rate of speed, and took his front sight with it. The only ones that are worth it are the ones where you actually tap the barrel. Get the screw on woosie pads, they are cheaper and do not permanently alter the gun.