The real-life Halo M90 shotgun I featured previously was actually built on a left-handed 870 Wingmaster. When I did the Christmas “historical” video about it, I didn’t show the actual internal mechanics, and I figured some of you folks would be interested to see how the trigger was relayed from the top of the receiver down to the bottom…
There is an antique multi barrel vertical stack percussion pistol with a hammer which marches down to each nipple as the trigger is pulled. the nipples are arranged in a “stairway” configuration