[@CollectorOfMyst] I suppose you are right regarding the revolver's mechanisms. But I doubt that will work for a rifle. Or maybe it will? I don't actually know. Also, spot on about the flintlocks and semi-auto guns.

However, I wanted a rifle like the Lee-Enfield where there's a bolt at the right-hand side of the gun you use to load the next shot rather than pulling the lever at the back of the gun. If I'm not wrong, both can realistically be made using clockwork mechanism and will work with bullets that are shaped like a ball instead of the modern bullets' shape. Again, I might be wrong ^-^"