For those who do not know there is a person making after market sights (rear insert only) replacement peep type sights for CZ rimfires (
ebrooks77.50megs.com). I got the four types of hump peeps he makes. I have found that I need a size smaller than I thought but then again I need one for hunting and another for paper punching (smaller hole).
He also makes other items for these rifles and has informatiom and downloadable targets. Give his site a visit. Also you can find him on WWW.RIMFIRECENTRAL.COM , do a search for Brookie.
Have a Nice Day!
Don Warren