I am thinking at least $5,000.00. Maybe $6,000. A skeet gun like you mentioned would be about four grand, even with the minor things you mentioned. And about two grand for the extra set of barrels. The lettering can be redone. How big is the chip in the forend? And which set of barrels do you think are lose? You can replace the forearm for a few hundred dollars. Or less. I have been slowly starting to shoot mine. But the price of these are going up and up all the time. And skeet guns are getting pretty pricey.
