WASR 20 years ago ? I dunno, maybe I guess. I would have thought only SAR's then - but the older I get, the fuzzier chronology gets. Saying the brake has 2 holes on top, would seem to indicate a '74 style brake, most likely of American manufacture. If easily confirmable to determine whether or not the barrel is threaded, you would most likely see a projecting spring loaded pin on the FSA. No pin, and a weld doesn't neccesarily mean no threads, but it might. Lots of variables here my friend. Photos could maybe lead to some answers from the more knowledgable.