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 AR15/M-16/M4/CAR15 RP Trigger Spring $9.97 Remington 1100 & 11-87 (LT/LW/SP), 20ga. Barrel seal O ring $7.50