Made in the USA, the The Apollo S from Ultradyne provides competition level recoil reduction and muzzle control. It is perfect for shooters who want drastic recoil reduction with less perceived blast. By using a scientific approach and studying thousands of recoil events, Ultradyne engineers have struck a balance between extreme recoil reduction, virtual elimination of muzzle rise, and less aggressive venting of gas. A timing nut is included for easy installation.