Ultradyne USA Apollo S Compensator Muzzle Brake with Timing Nut AR-10 6.5, 5/8-24 Thread, .975 Outside Diameter, Steel Nitride Finish UD10250 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.