on one of my cz 452's i have the erick brook peep sight and have hit the metal gong out to 200m 2-3 rounds out of 10 which isnt to bad my other cz 452 has a brno peep sight but probably wouldnt work well past 50m but the erick brook peep sight allows you to use the mauser type reciever sight and set it to 200m
Neil
Neil