Fix the small bulge and don't try to find new barrels. A good barrel smith can fix it by inserting a mandrell, heating the barrel and tapping the bulge down. He may have to remove the ribs. The barrels will need to be refinished. Try Dale at 816 444 2040.
A 3 frame 12ga was made for waterfowl and should have at least 30" barrels on it. They will be thick at the breach and heavy. If you want an upland gun, find one and buy it and don't try to make one out of a duck gun.
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