I used to have a TC Hawken and changed back and forth between cap & flint by changing the
breech plug and lock. Kept this up for a whole year. The flint verson was a whole lot more accurate.
Wife has a TC Hawken that was a flint. She changed to cap by screwing in a drum where the touch
hole is and putting on a cap lock. Had to heat and bend the hammer a little and cut out the plate
around the drum. Works fine. Never could convince her that flint was more accurate though.