Unless something has changed, you get everything you need to mount a scope with the rifle...the mounts might have been a special thing that the shop I bought it from included, they're a good set of people and occasionally do things like that from time to time, i.e. since the rifle comes with rings and ready for a mount, throwing in a mount to help sell the rifle is productive....or they'll put together their own sale packages similar to Savage packages, throw a decent scope mounted on a rifle at a great price to help sales, does us as consumers a favor too.

Anyway, I'd check out Ruger's hard copy catalog, in the back it has a listing of available rings for each rifle, and maximum approx. objective diameter that they'll work with. Seems to me that their Med. rings work with up to 45mm obj.'s (42mm) and the highs are for up to 50mm, but check it out for yourself to be sure.