How old is your SR9? If it's a fairly new version, you won't get much if any improvement in actual trigger pull weight with a Ghost bar. They do have one with an over-travel extension that needs to be fitted. I don't worry much about over-travel, if you get used to a gun by shooting it a lot, over-travel isn't an issue. If you are going to shoot IDPA, my guess is you will shoot it quite a bit. I would speed my money on some quick acquiring sights instead. I like a fiber optic front sight and a plain black flat faced comp. rear. Ruger sells a fiber front and rear that look pretty good for $63.