Ultradyne Apollo S Compensator, AR-15, 223/5.56, 1/2-28in, .975 Outside Diameter, 416 SS, Salt Bath Nitride, Black, UD10220

By using a scientific approach and studying thousands of recoil events Ultradyne engineers have struck a balance between extreme recoil reduction and less aggressive venting of gas without sacrificing the elimination of muzzle rise.