Part Number: K325
Includes both rebound slide and spring
Universal fit across 9mm/
reliable operation
competitive shooting
Wolff Hammer Spring Pak for S&W Pistols - 16/17/18 LB | 9mm/10mm/.40/.45 | Part 26581 magazine housing Part Number: K325Wolff Hammer Spring Pak S&W 9mm 10mm . 40 . 45 Pistols Wolff hammer spring pak (Part #26581) with three spring weights (16 17 18 LB) for tuning trigger pull in Smith & Wesson 3rd generation pistols. Premium USA made springs for customized performance. Compatible Models: 9mm Models: 39, 439, 539, 639, 3904, 3906, 3913, 3914, 3944, 3946, 3953, 3954, 59, 459, 559, 659, 5903, 5904, 5906, 5923, 5924, 5926, 5943, 5944, 5946, 469, 669, 6904, 6906, 6924,