Scope rings. CZ 452 special

[da357mag]

I have a 452 special I tried to put a scope on last night, the rings I have
are B-square high rings, 11mm dovetail base, they measure .750 from the
reciever base to the bottom of the scope base itself. the scope is a
centerpoint 4-16x40mm AO scope I decided to try on a recomendation. With
the bases on the scope sits on the rear sight base (I removed the rear sight)
and needs about 1/8th of an inch to clear the sight base. I have thought about "shimming" the scope to raise it slightly but I dont know what this
would do to the accuracey of the rifle, it dosn't sound like a good idea to me.
I was told about Barska rings and there "very high" rings and found them
on a site called optics planet. net, they are inexpensive and do look higher
but I have heard good and bad about Barska products, and nothing about
there scope rings. There site hsd no measurements on the ringe and did not
say if they were 3/8ths or 11mm. does anyone know about these rings? and
if not any ideas as to what I could use would be welcome. thanks in advance
Doug, DA357