When I was in the Air Force and stationed at Ft. Meade back in the early 90's, I purchased a Norinco (Chinese AK clone) from a company named Compasseco at a gun show. Compasseco has traditionally been an air gun company, but they branched out into importing other stuff, like the Norincos. I paid $300 for my Norinco at the time. About two weeks later I get a registered letter from the ATF and a letter from Compasseco that I had to return it to Compasseco. I can't recall the exact details, but it had something to do something in that batch of rifles wasn't "fixed" correctly to keep it from being full-auto, or something along those lines. The gist was, I could make it full auto quickly and easily and apparently that was a big no-no.
I returned the rifle, along with proof to the ATF that I had done so and was told by the company they would get back to me (us) about that batch. Well, time went on and the company was keeping us updated via emails, but it started to become clear that I wasn't going to get anything back. I demanded a replacement rifle instead of having that one "fixed." They claimed they couldn't do anything as they were still dealing with the ATF over it all and weren't permitted, etc, etc. Eventually emails and phones ceased. If I called I was put on hold and no one ever answered, or all I got was more excuses. Inevitably, Compasseco went out of business. As I understand it, they filed bankruptcy and was bought out. I believe they stayed in business under new ownership and a slightly changed name (if I recall they went from Compasseco, INC, to Compasseco Air Guns, or something like that). Either way, never got my AK, or replacement back or my money. They were hit hard with some hefty fines from the little I was able to find out which pretty much forced the bankruptcy.
