Cajun Gun Works did a trigger upgrade on one of my pistols. The trigger pull is lighter, but the real benefits are more subtle. The biggest benefit to me is the “reach reduction kit”. This moves the position of the trigger back toward the grip (I think it’s something like 3 or 5 mm, but I’ve forgotten). Everything is smoother as they spend time polishing the appropriate trigger parts. Polishing happens naturally as you fire the trigger, CGW just speeds the process up. They go with lighter weight springs which reduces trigger pull, but replace parts so you end up with a very reliable pistol.
Check out their website. Cajungunworks.com