A lot of Bulgarian AKs were imported in the early 90s. But the laws were changed so their importation stopped. A U.S. company called Aresnel (I've probably messed up the spelling of the company.) made these same semi-automatic AKs in America. Arsenel went so far as to bring Bulgarian gunsmiths over to ensure that they did it right. I think I read that Arsenel stopped making froged receivers about a year ago, so some still might be found. However, expect to pay about $600.
My Bulgarian AK is very acurate with Winchester ammo (2 inches at 100 yds), but who wants to spend a lot of money on ammo, when all we are really doing is blasting away. While the forged receiver increases the weight by about a 1/2 lb, it is worth it.
Anyone have experience with this company's weapons?