The Ultradyne UD10250 Apollo S: Proudly produced in the USA, offers unrivaled recoil reduction and muzzle control, setting a high standard for competitive use. Its design caters specifically to those shooters seeking significant recoil reduction without the intense blast experience.With a commitment to innovation, Ultradyne engineers undertook a meticulous study of thousands of recoil events. Their findings allowed them to take a scientific approach to design, achieving an optimal balance between exceptional recoil reduction, near-elimination of muzzle rise, and subtle gas venting.To facilitate ease of use, a timing nut is included in the package for hassle-free installation.