I split your post off the original so you can get responses w/o having to deal with that other thread. Welcome to the boards.
If this was an SKS I would have said that's a late commercial import with a scrubbed receiver as the S/N doesn't follow convention. I don't know about AK's, but others here will. Can you tell us what weapon it is (std. AK, semi auto made for civilian market, etc.), where and in what time frame it was obtained (back in the 80's vs. recently?), and what the import stamp is? That info will probably help the guys out quite a bit.