Spring Service Pak Type I STD S&W Pistol 9mm

Caliber 9mmLuger, Pistol Smith & Wesson Model 39, 439, 539, 639, 3904, 3906, 3944, 59, 459, 559, 659, 5903, 5904, 5906, 5924, 5926, 5943, 5944, 5946, 909 and/or 915, Spring Service Pak Type I STD-Factory Power, Code 69391 Wolff Gunsprings USA. Rework is perhaps necessary - professional installation recommended!Notice from Wolff Gunsprings - Type I for Smith & Wesson 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!