Dave,
Briley makes 20 gauge inserts for 10 gauge guns. I have not looked in a long time, but the cost was about $600. There are those out there that have tig welded Damascus barrels back together. Others still will monoblock your barrels with steel tubes that will let you shoot the same gauge or one gauge down. A restock may cost as much as $2000. There are more options, it just depends on how much you want to spend and who will advise you of all your options.
Harry
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