There are mounts that adapt Ruger integral base to picatinny style 'rail'. I'm not sure if any of those fit the Mini. I haven't even handled a Mini for decades but the most often mount I saw in the past was fitted into the ejector cover(?) or whatever that little plate is on the left action rail. It doesn't take much to mount the smaller dot optics--much less than required for a scope since the dot optics are so much smaller & lighter.