That's a good question. I have a 40mm objective on mine, and the rings it gave me are just a little too low to be just right: the elastic scope cover on the front doesn't go over, there's not enough room between the rail and the objective end of the scope. My rings may be "medium," not sure. I'd suggest just take your rifle with you to a gun show and get the scope & rings together from the same guy, and he should let you install it right there to make sure it'll fit before you have to lay down cash for it, cause after all if it doesn't fit you have no need to buy it.
ETA: What part of CA are you in? Reno show is coming up in just under 4 weeks, there will be a zillion scopes there. Also there's one in Vallejo today and I think also the Cow Palace in Daly City, I'm not sure.