First off, welcome to our forum ~

The SBH hunter comes w/1" rings and I believe them to be mediums. I sold mine (short version of long story ~ made the gun too tip heavy for me) so can't chk now. But they produce 30mm rings as an assessory but unfortunately, the lowest would be mediums as makers haven't recognized that there are 30mm streight body/tube optics out here and not just big bell rifle scopes requiring tall rings. On my non-ruger revolvers, I use warne low 30mm Maxima's for mounting the UDs. Of course the weaver style bases offsets some of the advantages of the low warnes ~ but that doesn't apply to your situation.
Be sure to chk if ring spacing is compatible w/the UD before putting out $$. Theres a 5gal bucket in the garage of various sundry things that failed to work out as I had planned.