The only real 'logic', if you'd like to connect with it that, is often a shotgun does not have a rifled barrel. Makes it very simple for your Goobermint; no rifling, it cannot be a rifle. Even so you'll find rifled shotgun barrels or slugs that may care for the https://us.enrollbusiness.com/BusinessProfile/6962446/Hand%20Crafted%20Metalworks