The Ultradyne UD10220 Apollo S is proudly made in the USA, offering a competition grade solution for recoil reduction and muzzle control. This product is created for those shooters looking for significant recoil minimization while maintaining a less noticeable blast.In the design process, Ultradyne engineers have employed a scientific methodology, analyzing thousands of recoil events. This rigorous study has resulted in an optimal balance achieving maximum recoil reduction, near-total elimination of muzzle rise, and less aggressive gas venting.To simplify the installation process, a timing nut is included with the product.