Wolff S&W 3904/5904, RECOIL CALIBRATION PAK

Recoil springs are available in a variety of load ratings to allow adjustment of the recoil function to meet various requirements. All load-rated recoil springs include an extra power firing pin spring.

For Use in:
39, 439, 539 ,639, 3904, 3906, 3944, 3946, 9mm
59, 459, 559, 659, 5903, 5904, 5906, 9mm
5923, 5924, 5926, 5943, 5944, 5946, 9mm
659, 909, 910, 915, 9mm

• Reduced Power…: 8, 10 & 12 Lb.
• Factory Standard.: 14 Lb.
• Extra Power……..: 16, 17, 18, 20 & 22 Lb.

Recoil Calibration Pak below includes 1 each 14 pound factory recoil spring and 1 each of 16, 17, 18 and 20 pound extra power recoil springs. 3 extra power firing pin springs are also included.