Weaver makes scope bases specifically for grooved receiver rimfire rifles. Give Wholesale Sports a call and I'm sure they can hook you up. I don't have access to my WS catalog at the moment, otherwise I'd be of more help. Once you have your bases, they'll accept weaver style rings, along with most other rings using the weaver crossbolt style. You need to know the tube diameter of the scope you're going to use before you order your rings, i.e., 7/8", 1" or 30mm. The diameter of your scope's objective lens is also important, as you can purchase low, med, & high (height of rings) rings, depending on the size of your objective. i.e., if your scope has a 50mm obj lens, you're probably going to need high rings, if it has a 36mm obj. you can probably get by with low rings. Basically, the closer you can mount your scope to your bore the better. Hope this helps.