Oh no, no, no, no. These guns were always around and will always be around. There's an evolution of firearms that started with a piece of pipe, a rock, some powder and a lit torch and is still evolving even today. Muzzloaders were the beginning of that evolution. Flintlocks and percussion were the apex of that one small part of the overall evolution. People never stopped using them because they were reliable and fairly accurate.
As long as there are gun tinkerers and history buffs, these guns will be around.
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My restored 1862 Bridesberg