You might give the Yo-Dave a try first. It made the trigger in my 452 just as nice as the one in my Annie 1416 and only cost $20. It can easily be changed back or removed if you decide to do something else afterward.
This.
Also, DO NOT try to clean your CZ with a .22 rod, the bore is too tight. You need a .17 or .20 rod, one-piece such as a Dewey, nothing else will do the job PROPERLY.
