I have a sw9f and have both the trigger and spring kit installed in it for awhile now. It made a world of difference to mine. The pull went from over 8lb (10lb is a guess because my trigger scale goes to 8lbs and I had to pull "alot" more to have the trigger release) and was gritty. Now it is smooth and breaks at 5.2lbs. The trigger reduced the takeup by at least 20% and there is no noticeable over travel now. Here is a pic.
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