Gunsandammo.com rated all 50 states and the District of Columbia on their firearm-friendliness based on these 5 categories: The legality of carrying a gun concealed or openly and ease of getting a permit; restrictions on semi-automatic such as magazine capacity; laws on ownership of items such as machine guns, silencers, short-barreled rifles, and shotguns; Castle Doctrine; and miscellaneous such as state constitution provisions, registration requirements, percentage of gun ownership, and availability of shooting ranges.