You don't know what you are talking about. The SKS is not a Kalashnikov of any sort. It is the Simonov Self Loading Carbine. SKS is short for Samozaryadnyi Karabin Simonova.
What is guy had was likely a semi-auto,non-NFA Kalashnikov rifle. These are widely available on the market and are basically a rifle consisting of parts from a real imported AK with a new receiver which cannot accept the selective fire components. What he had was probably a Kalashnikov just not an Avtomat Kalashnikov.
When I sold firearms in a department store a few years ago, the semi-auto version of the AK-47 that we sold was known as the MAK-90, for Modified AK year 1990. They were a cheap Chinese knockoff that looked like they'd fall apart the first time the owner pulled the trigger.
I love it when you talk Russian, but I'd guess it was parts for an AKM, rather than an AK. Or maybe it was even a WASR-10.