Researcher has covered the subject very well...
Dean, I would be taking a very hard look at the ends of those barrels again, especially on a "Trap Grade" 20ga.
With a little bit of choke, I would not be surprised to find they have been cut. Back in the day, turning long barreled tight choked guns into short barreled Skeet and open choked Grouse/Quail guns was more common than some people might think. Especially if the barrel ends had been damaged at some point... If the serial number is in the books, there is a possibility original barrel length could be confirmed.
Best, CSL
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