Ain't a lawyer, but I always thought that all guns with barrels over 0.50 inches were automatically a Destructive Device with shotguns being let through with the "sporting purpose" exemption, and that to be considered a sporting gun it had to adhere to the minimum barrel & overall length rules. That's the reason that you see 410 revolvers, 28 and up are over the half inch.
Not going to lie, if this does bear fruit, I may have to add one of these guns to my "guns that I want even though they are useless". I blame holywood.
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