I doubt that any where imported during the time of the Soviet Union.
Mine is a 16 ga made by the same company that now makes the Baikal, Izhevst Mashina, and is clearly stamped CCCP. And it shoots standard folded crimp shells without any problem.
I have an IJ 18 12 gauge single shot that my dad bought me in 1984, it was a used gun that is marked made in the USSR. It was imported into Florida and at some point made it into Canada where my dad bought it.
Edit: It is marked " Universal Sporting Goods Miami Fla"
It's been a solid gun that has harvested grouse ducks, geese and even a deer for me.
