I think you'll find that due to a Russia/US trade agreement that the US will not allow Russian made firearms in.
That being said certain firearms are allowed due to naming criteria i.e you can import a Saiga. The main focus was military rifles so SKS, AK's, MN 91/30, SVT 40's etc. As most, I think, SVT 40's were Russian made the states cant get any more imported.
What they have for Russian made pre ban is about it. Kind of like Cubin cigars, they have to be flown over or around the US to get to Canada if you pass throught the states with one you're in deep crap.
When it comes to ammo, they concider the steel cored ammo as being armour piercing so we get all the surplus ammo.