Break in

[Rocky Raab]

Firelapping kits nclude soft lead bullets embedded with varying degrees of lapping compound. You are instructed to handload reduced charges and start with a few shots of the coarse grit, then move through the finer grits until you're happy.

I've never used one, due to my own worries about what the process does to the rifle's throat.

I'm also not aware of any in rimfire form. Can't imagine why anybody would want it except to remove severe rusting - and such a barrel would likely be beyond salvage.

Baylian, your CZ is about as good as they come. Just clean it and then shoot it.