If you talking about the FAC ones with the cast aluminum receiver (which is what I am assuming you mean by "interesting"), I'd tell you stay away. You can tell because the cast ones because they don't have the groove on the outside length of the receiver, which is where the sliding stock slides into (pic: http://mwdg3.homestead.com/files/SAR8.jpg).I saw one unsale the other day, Aside from a rather interesting looking receiver does anyone have an opinion on these guns?
All parts one mine are FMP. (except the receiver, obviously, too bad).From what I have seen most are from Portugal, parts are of very nice quality. Current PTR-91's are made of a lot of Port parts.