for old firearms, is hanging one really any particular risk to have it stolen? for the most part, they aren't worth that much, have serial numbers on them, and aren't particularly usefull in terms of someone flipping them for cash, or using them for further criminal activity. I do think about taking an old Parker Shotgun that was a family item, out of the safe, and making a mount for it to put over the fireplace. It is not in great condition, and while I do think it would fire, the stock is a bit cracked, and the barrel is dented, so - I don't think I'll ever use it, but it would kill me if it was stolen, so - it sits in the safe.
