Just curious about the barrels. I recently bought an older traditions percussion rifle and have been interested in the theory of changing it to a flintlock. Don't know if I will. Both barrels from a traditions rifle are held in with a removable pin and the models I see on line look the same except 1 has a nipple and drum and 1 has a vent hole or flash hole. My question is internally are the barrels the same. Same barrel same breach plug. And the only difference is the drum and vent hole or are they a totally different design?