I suspect this gun was originally flint, and full stocked, given the lack of a nose cap, and the barrel length being pretty exesive for a half stock. The hogged out lock mortise could indicate the flint lock was replaced with a cheap percussion lock, by someone that was not a gunsmith. The vent pick inlay also makes me think this gun was a fine flintlock in its day. The single lock bolt might only indicate that the original lock had a forward hook, or staple to retaine the nose of the lock. The profusion of diamond patterned inlays make me think of North Carolina, but the fancy double patch box looks very Eastern Tennessee to me. Whoever made this rifle was indeed a real craftsman. The triggerguard is a beautiful piece of forging and filing.
Hungry Horse