I recently installed a CGW (Cajun Gun Works) spring kit in my tristar/canik C-100 (I mainly got the canik based on some of the positive reviews I have been reading in the magazines and on the net to try it out.) The CGW spring kit does wonders for the trigger on these guns. The double action pull is no longer stiff and heavy as this is one of the main things some of the gun magazine reviews have pointed out. Single action is also improved and feels great now.
If you have one of these guns, I highly recommend you get up with CGW (Cajun Gun Works) and order one of the kits as it truly transforms the trigger into a real trigger on these guns (You literally have a completely different trigger feel that is much smoother and lighter). Installing the spring kit with the mainspring, FPB spring, and firing pin spring is straightforward, and can easily be accomplished in 10 minutes or so (only takes a small punch to do). If you aren't a DIY person, I think they offer installation of all of their parts. Awesome kit!