The 257 rings measure 1.27" from the top of the BOTTOM ring to the dovetail, and the scope's objective size taken from Midway USA is 2.50" so if you cut 2.50 in half, you would have 1.25", 2 hundredths of an inch. Might be a tight fit though. If you decide to get the taller 257's, go on BKL's site instead of cz452.com and they'll have the taller rings to choose for about the same price as on cz452.com.