I can see the external pitting on the barrels (not the internal)..and the nasty rusted sliding breech.
http://www.flickr.com/photos/22096451@N05/2214058642/in/photostream/
Before I spent any money on this project...I'd ask myself what am I going to have 'X' amount of dollars later ? In two decades will it be worth the investment ?

Save yourself...look for another gun.