I'll bet the side with .020 choke is the .021 thickness six inches from the muzzle. If you think a 16 is thin, one finds that the 20 which has more chamber pressure usually is sometimes even thinner, and the 16 and 20 never approach the thickness of 12 gauge guns. Plus the barrels were refinished, right? I am guessing because of the finish being so good. There may have been a little metal removed in the prep for rust bluing, or to remove an external scratch. But in all likelihood, they left the factory that thin.
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