Turns out the gun was made by an American

and the Russians were suitably impressed/horrified enough to repost it.

80 Grit built this one, and posted it to TAG

http://www.talonairgun.com/forum/viewtopic.php?t=17145&highlight=grit

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremecy