Some of you know, I'm all about Japanese cinema. One of my favorites is the Lone Wolf and Cub series, a ronin travels the country assassinating for money. He is accompanied by his toddler son, whom he pushes in a wooden baby cart. The cart is loaded with weapons. So here's the question. One of the weapons is a Gatling style gun that pops out the front, and fires full auto. For the period, it would have to be black powder. If one were to attempt to replicate this baby cart for giggles, and crafted it by hand, is such a monstrosity legal?