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They are probably Russian refurbs that have flooded the market here in Canada recently. Good guns, good price.

Although that photo is photoshopped, they do actually exist. They are called the "obrez" and were used in the Russian civil war.

https://www.milsurps.com/images/imported/2009/11/obrez-1.jpg
...

I don't think any consideration is given to available technology in any other military record held so I don't see why this would be any special. In another 10 years they will have something even...

More photos:

https://www.milsurps.com/images/imported/2009/10/exfrenchthompsonsmg5dg-1.jpg

https://www.milsurps.com/images/imported/2009/10/piat-1.jpg
...

Definitely anything they could get, check out this t-34/76 they pulled out of a swamp in Estonia in 2000:

https://www.milsurps.com/images/imported/2009/10/6-1.jpg
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Wow, will you be my new dad?