The definition of an AOW says in part that the term includes a smoothbore pistol or revolver designed to fire a fixed shotgun shell. In theory that could include a .22 since there are .22 shot shells, but it would not include other calibers.
Also, most of the little "derringers" I have seen did have rifled barrels, although corrosion and time has often almost eliminated the rifling, and proving that the smooth bore is not the result of wear and tear would be difficult.
Realistically, I can't see BATFE, with all their other duties and problems (some self-created), worrying about prosecuting someone for selling or possessing a gun of that type, smooth bore or not.
Jim
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