12 gauge handgun?

[geologist]

They are only 20 gauge but Google Ithaca Auto & Burglar. I'd love to score one. There are a few in Canada.

 

[turbo_bird]

A Very pistol is 12 ga. However, modifying one to fire shotshells would lead to having bits of orange flaregun picked out of your torso and face, in the ER.

Don't even bother. I have it on very good authority from a guy that made a 410 barrel for one of those. It didn't work out well. It self destructed after 3 shots. Nobody got hurt, but he was left holding the pistol grip with a very confused look on his face. The barrel and the rest of the gun landed about 50 feet behind him.
Kristian