My first instinct was that it was a sporting rifle. Once upon a time, it was a pretty nice one, too. I love that top-hinged, oval patch box in the stock. Of course, it's not your friend's fault that it is now so beat up. I see what I think are replacement screws holding the butt plat on. I do believe it was always a percussion rifle. The engraving on the lock plate and hammer are very nice. Too bad about the wood chip missing above the lock plate, but that's not unusual. I think it's a very neat display piece. I just noticed the little floral stamps all around the muzzle, too. COOL! This was a gentleman's rifle. Consult with Jobe and some of the other guys about how your friend should best conserve this piece.