The first question is: What do you use the gun for?
If it's home defense and/or carry I would say get some night sights (Tru-Glo TFO) andcall it a day. The stock trigger is MORE than suffient for those purposes.
If it's for competition use (which I doubt because it's a compact model) then that's a whole other issue, and one on which I am not qualified to comment.