Agreed, i was pretty shocked by the damage too.
The gun was in a toe under canvas and leather case from jeff's outfitters.
The case was next to a wall that had an in-wall air conditioner unit. Over the period of a few days that had really high highs and moderate lows, the wall had some light condensation on it. When it got hot again, I'm guessing that the condensation evaporated but got in the case a bit. Think of what happens to a half full water bottle when you leave it in a hot car for a few hours when you're out shooting skeet, and you'll get the idea......
Good lesson learned if nothing else. If it had happened to my Ken Hurst custom sporting clays gun, I would've shot the air conditioner with a 10ga....
The pitting is on the outside of the barrels. Which tool is best to polish the exterior of barrels best?
Thanks again everyone.