Chambered in 9x18 Makarov, it is reminiscent of the Uzi. It's a close quarters weapon, the suppressor is removable and the stock collapses. Introduced in 1995 and select fire, so there just aren't any of these in the U.S., making it a true grail gun.
Here's the World Firearms write-up.
And a video, in Russian. You don't need words to see it being fired with accuracy near the end.