On my P-09, I did all the requisite polishing and stoning of the internals. Watch JoeL's videos, he goes by Joe Mustang on Youtube and is an active and valued member here. I also polished the hammer strut and put a slight radius at the back of the slide on the bottom where it first contacts the hammer when cycling.
I also bought the extended firing pin kit with reduced power hammer spring.
I've also added the lighter sear spring and polished the sides of the firing pin block plunger.
The last thing I did, do at your own risk because you may affect timing, but I also stoned down my hammer hooks to reduce pre-travel. I get just the slightest camming on the hammer (it travels backward when pulling the trigger in single action, before it releases). I don't use this gun as a self defense weapon, which was my justification for this last modification. I figured if I messed it up, I'd buy a new hammer from Cajun Gun Works.
My P-09 is my softest shooting, best trigger of all five of my CZs. In my opinion, you don't need to spend a lot of money to make these guns really slick.
Keep us posted!
