Sounds like Baikal MP 221 ARTEMIDA. They make a mount for it, but it is not QD.
Some German manufac. makes a QD but it is very pricey. If wanted I can get you more info.
If it is a Baikal (which I almost bet) it might be the best bet to take a good quality 11 mm to weaver profil adapter and have a gunsmith permanetly attach it (if it fits-rail would have to be high enough).
The 11 mm Rail is 1) not cross sloted 2) not very precisely machined on Baikals (return to zero would be a problem) 3) generally not common enough in big game rifles for manufactures to provide solutions.
I do have a Baikal Single Shot .30-06 that I went through with this. The factory rail was worthless. In the end I took it of and attached a steel aftermarket 11 mm Rail, cross slotted it and used Warne Rings (permanents) to scope.
I wish you great shooting and hunting with the rifle and look forward to some pics.
Perhaps I would also reconsider the scoping at all?
