I am trying to find some info on the following rifle. The info is as follows....Imbel Pac 12665 Itajuba Braxil Pacific Armament corp FZ SA 7.62 C3A. The selector switch shows three positions...S,R,and A. I believe this is A FN-FAL in 7.62x51. The seller wants $650. It looks like it is in good shape with no rust and a good bore. This is the first time I have seen a rifle of this kind and I know nothing about this type . Thanks for any info as to what it is and is it a good buy?