Wouldn't this still fall under Title 2 as either a destructive device or AOW? (AOW if designed as a shotgun with pistol grip, DD if designed as a pistol that happens to also be capable of shooting shotgun shells.)
The real sticking point is the caliber of the weapon if you want to market it as a pistol.
For reference on the DD portion, we have the
Desert Eagle, .50AE.
Quote:
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Original blueprints had been to use .510" diameter rounds (like the .50 BMG), but the polygonal rifling of the final prototype Desert Eagle allowed the .50 caliber bore plug to drop through, thus rendering the gun a destructive device under Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) regulations (this no longer applies on current models). Nominal bullet diameter was reduced to the current 0.500 inch (12.7 mm).
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Sadly, that specific quote does not appear sourced, but the logic seems sound.
For reference on the AOW portion, we have the
Serbu Super Shorty, an AOW (NOT a short barrel shotgun under Title 2.)
That being said, the SSS with the mini slugs may work out for you if your state has AOWs on the allowed list.
Finally, I do believe that Montana allows you to make your own guns with up to 1.5 inch barrels so long as you use materials and labor in Montana for the purpose of owning the weapon in Montana. That law has not yet been tested in court however as far as I am aware.
EDIT:
http://en.wikipedia.org/wiki/Montana...ms_Freedom_Act is the link to the wiki article on the Montana law I mentioned.