I think the terminologies might be a bit off here. I don’t think it was “shotguns” that they were carrying. Probably more like pistols or revolvers. Shotguns are big, like rifles, and they shoot a volley of buckshot. Two different things.When a friend of mine moved from NYC to Louisiana, he was at first amazed that almost everyone, including women professors he knew from LSU, carried shotguns with them everywhere. It was part of their get-up like a pocketbook.
I could be wrong, but I’ve never seen people carrying around shotguns in their daily lives. And they would be impossible to conceal by their very nature.