I have had the unique privilege of handling and FIRING the inventor's revolvers with these hammers installed. Unbelievable! I have a Smith & Wesson 625 that I had Ron Power do a complete Grand Master job on quite a few years ago, and thought that was the smoothest, lightest action I'd ever shot (I shot Bowling Pin matches for over a decade, and shoot USPSA steel plate competition now). Yet, the revolvers I got to shoot that had the Revup Action hammer kit installed took the action to another level entirely. The trigger pull starts out about normal, then quickly begins reducing the trigger pull, down to around 2.4 pounds. That is about what I get out of my 625 Grandmaster, IN SINGLE ACTION. The Revup Action Hammer is DOUBLE ACTION! I've got to be getting one or two of these for myself. I have a 929 (9mm) S&W that I have had an action job on, as well as a 617-10 shot .22LR that I regularly compete with, and I'm just going nuts wanting to take both of these to the next level.