Here's a bit of information which may be of benefit to someone installing a scope on a CZ 527. I recently purchased a set of the Warne 16mm dovetail rings in medium height to install an Athlon Argos 6-24 x 50 scope on my 527 Varmint rifle. Unfortunately the rings were just a tiny bit too short, and the knob on the bolt handle made contact with the power adjustment ring on the scope (which has an eyepiece diameter of 1.8"). It was such a tiny contact that I could pull the bolt all the way back with minimal effort, and there was adequate clearance between the bolt and the eyepiece itself. Needless to say, I considered this unsatisfactory, and have returned the rings to Midway to exchange for the tall Warne rings which should work just fine. Hopefully this will be of some help to someone at some time in the future. I know this info would have certainly helped me.