Wolff S&W 39/3904 9MM, SERVICE PAK TYPE-II
TYPE I – For Smith & Wesson semiautomatic pistols contains the following springs to replace weakened or broken springs, returning the pistol to original factory condition: recoil spring, extra power firing pin spring, hammer spring, extractor spring, 2 ejector springs, magazine catch spring, drawbar plunger spring, safety lever plunger spring, slide lock plunger spring, safety lever detent spring and rear sight body plunger spring.
TYPE II – contains all springs described in Type I pak above and a +5% extra power magazine spring.
For Use in:
39, 439, 539, 639, 3904,3906, 3944, 909, 9mm