Gents

I'm looking for a valuation for a friend for his CO2 match rifle.
Any ideas fellas what he should be looking for realistically....?

Rifle details:
Feinwerkbau C60
CO2 bulk filled
.177 Calibre
Purhased new 09/04/02.
Slight rust on muzzle end of barrel and front barrel weight as seen in photos
CO2 Cylinder included (TW6.4kg/GW11.4kg)
Case not included.

Photos here:
http://www.flickr.com/photos/harvey_...7632483305612/
http://www.flickr.com/photos/harvey_...7632483305612/
http://www.flickr.com/photos/harvey_...7632483305612/