I have a RMH and I would not try to convert it to Flintlock. If you were asking about a gun that had a drum and nipple setup like a Pedersoli Frontier rifle, then the conversion, in theory, is not too difficult and again, in theory, you can just purchase a flint lock that matches the current percussion lock in shape and plunk it in after removing the drum and putting in a touch hole liner. But when you have a breech with a snail setup it would be much more difficult to convert. Like Zonie said, anything is possible but sometimes probably not worth it.