Yeah that display is amazing, but the timeline is a bit off. The real crazy tinkering started earlier, like with Forsyth's scent-bottle lock in 1807. By 1820 they were already past the first big wave. @hannahcraig, if you want that early chaos, look at the transition from flintlocks. Books on "percussion era" small arms usually cover it, but you have to dig for the 1810s stuff specifically. That's when every gunsmith had a wild new idea every Tuesday.