Wilson Combat SPRING, RECOIL, 1911, 4.25", 12LB

Recommended Use: Commander-Size 4.25" 9mm shooting full charge ammunition or .38 Super / .45 ACP shooting target ammunition with a power factor of 130,000 to 150,000 (Velocity x Bullet Weight = Power Factor) Average Service Life: 4,000 Rounds Wilson Combat Heavy-Duty Recoil Springs are made combat tough to repeatedly take a pounding yet show remarkably consistent performance every time a round is fired. Keeping a fresh recoil spring in your pistol will dramatically reduce the pounding your slide and frame receive.