Ultradyne USA Lithium PCC Compensator Muzzle Brake with Timing Nut, PCC, 9MM, 1/2-28 Thread, 1.125 Outside Diameter, 416 SS, Black Nitride Finish UD11030 High quality components and precise manufacturing make Ultradyne parts ideal for maintaining and upgrading firearms. The durability" reliability and excellent build quality of these parts will ensure years of service you can count on.