I agree the lock has been reconverted with the fresh scar in the wood above the lock plate's top edge, several modern screws with flat-bottomed, machine cut slots, and a flat end on the cock screw. When a gun has gone through a restoration process, as evidenced by the wood added above the nose of the lock and what appears to be a refinish, it becomes harder to tell what is original and what might be added, unless examined in-hand.
From what I can see, I think the patchbox is original based on its old iron screws and how well/tightly it's filled in around its edges, no really noticeable gaps as you often see on remounted patchboxes. The forestock inlays look like later additions to me, but I'd like to see a good photo of one, taken close up, to get a better feel for them. The rifling puzzles me, since the gun looks so much like a PA buck & ball gun. The fact the bore and rifling look clean inside, I'd lean toward a modern rifling job on a buck & ball barrel with enough wall thickness to support careful new rifling.
Shelby Gallien