I have one quite similarly built. It is a shortened CVA kentucky stock ( originally percussion), with a CVA mountain rifle flintlock in it. The barrel is from a .68 cal. English sea service pistol, made in Japan. And the trigger, and plate, triggerguard, and ramrod pipe, are all shop made. That lock is not much for longevity, but some of the modern lock manufacturers would do well to study the lock geometry, and frizzen material. Mine is very reliable, and not hard on flints, even though it uses small ones.
Hungry Horse