I just looked at one of these Baikal SXS's in .30-06 the other day. I am sorry I did not pay closer attention, but if the rib is flat and thick enough to allow windage screw clearance, I believe it should be possible to have the rib drilled and tapped and a steel Marlin 336 scope base of "Redfield" type mounted. I just used one, slightly modified for attachment to a Romanian .22 as posted elsewhere. Said .22 had a flat receiver top and all has worked well.

Using a "Redfield" type base would allow you to select whatever height rings the rifle/scope required and you are comfortable with. As you all probably know, "Redfield"-type bases as made by Redfield, Burris or Leupold are not QD if that matters to you.