I have three, CZ 527, x2 17 hornets, and a .204, and none required any bolt mod, and have std Cz or Talley rings, Z3 4x12, Z5 3-18x44 power, and 4x12x40 power Nikon monarch, have also had a .223 American,
the CZ bolts have been modified, for at least five years, perhaps longer, so unless its old stock, it wont be a problem, but it keeps coming up on the net.
The Cz rings are a bit high for a 1" 40mm scope, but about right for a 50mm, I like the tally rings more. bit lower, less chunky.
One thing to watch, is the size of the objective bell, on the rear scope, you want slim, Leupold, swarvo etc, not Burris chunky.
I should add, that CZ sells, the modified bolt handle, for older 527 rifles.
What cal you looking at,
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