If you looked at something like the Pedersoli Hawken or Kentucky rifle they have generic locks that are common on a few of the Pedersoli firearm range ,so the flintlock can be swapped for the Caplock by just switching the vent/flash hole for the drum and nipple. I have one of each of the above rifles and just swap locks as I feel the need. When I got My Kentucky second-hand it arrived with both the Flint and percussion locks. Certainly removes the dilemma of flint or percussion.