I think the rotary system fired the barrels in order, needing to be cocked by the rear trigger in between shots. Like a double action pistol with the rear trigger doing the cocking and the front firing the gun. Sounds complicated but this example is 140 years old and still works. With the right geometry the cocking should be a reasonable effort. Front trigger pull 3.5, rear trigger 5-6 pounds type difference. The other multiple barreled (4) Lancaster I recall was choke all four barrels choked modified so order of firing is not a big consideration. On a driven shoot I expect this gun would be a lot of fun to use. As long as cocking was not that difficult. But I’ll never know.
