I have had a MTR, 20in barrel, since March of last year.
It started a CZ adiction.
Anyhow. Clean the new barrel real good. Even with a bronze brush a couple of wet strokes.
Wipe with patches till they come out clean. it will be nasty with brown stuff from the factory.
I have the DIProducts rail, extended mag release and their bolt knob on mine.
You are gonna love it. I hope it is a shooter out of the box. You know it is the only CZ 22r that has a match chamber.
Good luck.
Congratulations.