No history on the stalker.
No markings on the top or sides of the barrel.
No sign of receiver repair. If a new barrel was fitted would they stamp the barrel or receiver with the eagle over "J"?
I can't find the two barrel tube marks in "The Standard Directory of Proof marks" but will try to poist a close up.
http://s585.photobucket.com/albums/ss291...relMarkings.jpg
Otto