im not sure if its a drum or a bolster i always called it a snail breach. i have a buddy who is a great gun smith just forgot to ask him his opinion, i actually just got cleaned up from sanding off the poly finish. im going to stain it, it has some pretty wood underneath. i know i would have to change the lock and the breech. i think i could do it for less than what a kit would cost from these dealers. well see maybe just wishful thinking. traditions does not make it in a flint and im really craving a flint.