gsstewart44,
Before he goes cutting off those barrels, I remebered a neighbor bought a double (ironically a Navy arms 10 gauge muzzle loader) it had been shot a few times and then put away dirty for years.
The barrels were caked and crusted rust on the inside. he chucked a cleaning rod and a home made steel wool bore sized brush into an electric drill, eventually it all worked out, they shined and smoothed right up.
Some years later, He wanted a gun that I had, and I had an interest in the navy arms 10. he felt obligated to tell me the story before we made the deal. It works great, patterns just fine, and you could never tell how bad those barrels were by looking at them now.
He may really want a howda pistol, but with a little work the 20 gauge is likley salvagable. And there would be no chance of "legal" ramifications by keeping it original.
Rvtrav