Still kind of off topic though, the question wasn’t really around offering it up to a collector. Plus, let’s say he keeps it original and shoots out the barrel eventually, what then? Barrels don’t last forever and they are a replaceable item (if you use it enough). My Dads other rifle an old Sako Forester 243 falls into this exact category, it shot out the barrel and it needed a new one. Not that hard to put a new one on that looks just like original. Just like a new piston, head, bearing etc in a car.
Plus as per the original post the rifle is already modified in other areas anyway.