Just measured the American 17hmr -fit was exactly the same on CZ 22 Style.
Burris medium signature rimfire rings , max ocular diameter 1.500" ,,max objective 2.130".
The bolt on both rifles comes within 1/10" of ocular ,,about 0.35" of objective lens.
The scope is a 5.5x16.5 monarch ucc on hmr , Style has a 3x9-32 weaver classic rimfire.
A few guys on Rimfirecentral did some testing in the Ajustable Objective ideas -- with your eye lined up as crooked as you can get it in the scope it makes a difference of roughly 1/4" off at 50yds..
So scopes with 100yd. parallax should be fine unless you're shooting bugs and drinking a lot.
