The American Civil War developed quite a few such weapons, starting from so-called “volley” guns that sprayed several rifle bullets abruptly similar to a shotgun, to multishot, semi-automatic weapons just like the Agar machine gun, which was nicknamed the “espresso grinder” with the way it fed its ammunition. Best recognised https://machguns.com/product/colt-1928-navy-thompson-submachine-gun-transferable/