It is a Christopher Funk, a good maker, but if it is the one I think it is, the scope mount is permanent and has bases screwed into the old claw mount bases.

The gun is still worth $1,300-$1,500 however, if unaltered and not re-blued in a hot tank. I would take off the scope and use it sans scope, if the rear pop up sight is still present. It looks like a WWII bring-back that Joe Blow's Gunsmithing got a hold of and made a "shooter". It could be a diamond in the rough, or just a QZ.

It probably has 65mm chambers. It is obvious that the owner knows nothing about drillings, as he thinks that the maker of the steel for the barrels was the manufacturer of the gun.