Dear sirs..I have a mystery nug.... safn 49...matching numbers including stock...serial number range 351xx...in .308...in don't have a FN book and it looks like the crown on top of chamber area of reciever ring is ground off like an Argentine....detachable 10 round magazine.... thread protector with some barrel proud....no Arabic...scope rail on left...rear sight calibrated to 1000.. Anyone have any Data?