the thing you have to worry about is not whether the objective will touch the barrel, but whether the bolt handle will clear the objective bell. I bought the Leupold med 1" rings, they are just a shade lower than the CZ rings but are of better quality as they have the torx screws and not those useless flatheads that you get from CZ. I have a Leupold VXIII 2.5-8x36 on my 527 and the bolt just barely clears the optic bell. Still yet, the objective sits too high off the barrel for my taste. You can forget mounting one of those big objective bell scopes like a Zeiss or Swarovski on CZ.