U.S. Patent No. 4,693,027

The Power Rib Mainspring developed by W.C. Wolff Company is a patented mainspring for use in Smith & Wesson K, L and N frame revolvers. This spring has a unique variable power rib-back design. The Wolff Power Rib Mainspring dramatically improves the smoothness and consistency of trigger pull essentially eliminating stack up as well as providing optimum hammer action. This spring can usually take the place of expensive trigger jobs, with better results. For most target and non-critical applications, we recommend the TYPE-2 spring which is reduced power. For critical applications such as law enforcement, we strongly recommend the TYPE-1 spring which is factory equivalent in strength.

K-Frame models: 10, 12, 13, 14, 15, 16, 17, 18, 19, 65, 66, 67, 617, 648
L-Frame models: 581, 586, 681, 686, 696
N-Frame models: 24, 25, 27, 28, 29, 57, 610, 624, 625, 627, 629, 657

Type 1 - Factory Standard Power Rib mainspring only.

Type 2 - Reduced power Power Rib mainspring only.

Power Rib Shooter's Paks - Shooter's paks for Smith & Wesson K, L and N frame revolvers contain a Power Rib mainspring and 1 each of 13, 14 and 15 pound reduced power rebound springs allowing optimum adjustment of the hammer and trigger functions. As mentioned above, these paks can often take the place of expensive "trigger jobs" with better results.

Type 1 Pak - Includes a Factory Standard mainspring.

Type 2 Pak - Includes a Reduced Power mainspring

Cylinder Stop springs are available in factory and extra power strengths. These critical springs can easily be damaged or weakened making replacement necessary.

Rebound Springs - Trigger rebound springs are common to all Smith & Wesson J, K, L and N frame revolvers. These springs greatly influence the double action trigger pull which is a major concern of competitive shooters. W.C. Wolff company offers reduced power rebound springs rated from 12 to 16 pounds. For reference, the factory rebound spring is 18 pounds. These springs lighten trigger and let-off functions for smoother and easier trigger pull. We offer these springs in several assortment paks as well as individually.

Individually sold Rebound Springs. Available in 11, 12, 13, 14, 15, & 16 Lb ratings. Available in Paks of 1, 3, & 10.

Shooters Pak - Reduced Power - Stock Number 17125 - This pak for centerfire models contains 1 each 8 pound reduced power hammer spring and 1 each 13, 14 and 15 pound reduced power rebound springs allowing adjustment for lighter and smoother trigger and hammer action.

Shooters Pak - Reduced Power - Stock Number 17126 - This pak for rimfire models contains 1 each 9 pound reduced power hammer spring and 1 each 13, 14 and 15 pound reduced power rebound springs allowing adjustment for lighter and smoother trigger and hammer action. Note: Rimfire models 317, 650, 651 have a 12 Lb. factory hammer spring.

Hammer Springs (mainsprings)

• Reduced Power...: 8 Lb.
• Factory Standard.: 8.5 Lb.
• Extra Power.........: 9 Lb.

Note: Models 317, 650, 651 have a 12lb rated hammer spring.

Hammer Spring Pak - This pak contains 1 each 8, 8.5 and 9 pound hammer springs allowing optimum choice for your J-frame hammer action.

Rebound Springs - Trigger rebound springs are common to all Smith & Wesson J, K, L and N frame revolvers. These springs greatly influence the double action trigger pull which is a major concern of competitive shooters. W.C. Wolff company offers reduced power rebound springs rated from 12 to 16 pounds. For reference, the factory rebound spring is 18 pounds. These springs lighten trigger and let-off functions for smoother and easier trigger pull. We offer these springs in several assortment paks as well as individually.

Individually sold Rebound Springs. Available in 11, 12, 13, 14, 15, & 16 Lb ratings. Available in Paks of 1, 3, & 10.