...Nowlin makes quality parts , and they will improve your existing trigger!
Whether it will reduce your trigger pull to exactly 3.5lbs is another story. If your hammer and sear pin frame holes are exactly in the right place and there is no drag from the frame tangs, and the trigger has no resistance or drag on the frame then I would say yes. If not, you might be at 3&3/4 to 4 lbs.. Not every trigger set is "drop-in," but it will be close and if you are having problems with it I am sure you can get help over the Forum to work out the details.
Barry


Barry