The founding writers of the constitution never imagined people would fit hand cannons in their pants … Try walking around with an 18 inch pistol concealed in your pants.
Hand cannons for hundreds of years before the writing of the Constitution were smaller than that. Where do you get this idea hand cannons were always that large?:
In 1432, Joseon dynasty under the reign of Sejong the Great introduced the world’s first handgun named se-chongtong (세총통). Se-chongtong has a total length of 13.8 cm [5.4in] … Se-chongtong was used by both soldiers and civilians, including women and children, as a personal defense weapon