Talley makes a nice ring that will fit properly. I bought a set from Prophet River. You likely have the 11mm dovetail, but it pays to measure research that point, and also measure. There are some drawings on the net showing how to measure a CZ to determine which is which. My CZ453 Varmint was supposed to have the 3/8 dovetail, but for some reason the fluted version has 11mm, despite the factory chart.