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Evidently because its either a rifled barrel shorter than 16 in or a smooth bore / shotgun barrel shorter than 18 in.
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Barrel length doesn't matter on a pistol/revolver with a rifled barrel.
If it is a smooth-bore barrel, its a whole different story, and it would not be able to be sold without being an NFA item from the start, but, it appears to have a rifled barrel for the .45/.410 (according to some magazine reviews, Ross's website lacks a bit of detail), so its just a pistol with a .45 caliber barrel, that just happens to be able to shoot shotshells from the same rifled barrel.