Ruger Mk I, II, III Pistol Performance Pak $29.97 Contains 1 each extra power recoil spring, firing pin spring, reduced power hammer spring and a reduced power trigger spring for improved performance. 30380 Out of stock Categories: Ruger, Wolff Gun Springs Related products Colt Government 1911 Conventional Recoil Spring 13lb. $14.97 Enfield 1914 / 1917 Rifle Service Pak $24.97