One thing to note is that the rebound spring has a significant effect on the SA trigger pull weight. Currently I have a 12 lbs rebound spring in my 617 and the SA trigger is below 2 lbs.. All of my other revolvers have 14 lbs. rebound springs installed and this produces a SA trigger just over 3 lbs. with the factory mainspring. Personally, I won't let anyone except for myself use my 617 in single action, the trigger is just too light. One of these days I'll end up changing it to a 14 lbs. spring but right now it is fun to shoot with and makes getting a really small group pretty easy.