17121 Wolff Smith & Wesson K L N RP Shooters Pak Type 2

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 2 Pak – Includes a Reduced Power mainspring