Try a Millet Saddle Mount.
Easy to install ... drive out the two trigger group pins, slide the saddle over the receiver, align the holes, and use the two screws furnished ( allen head wrench provided ) to replace the trigger group pins. Takes about 3 minutes. From there, use standard Weaver type rings ... I would recommend the Millet "Angle Loc" (windage adjustment type) rings however, ... about $10 to $ 15 more than Weavers, but a much nicer looking installation.