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. 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. Includes S&W Reduced Power Rebound Spring (5) Pack. (12, 13, 14, 15, and 16 lb springs).