OK so this piece is a restock, more on that later as I get a chance to take real photos. At the moment, I'm trying to assign a date. My guess is a restock possibly in the 1830s but it's still flint, appears to have always been flint. I'm not particularly knowledgeable about western stuff but I can say for sure it has not been reconverted and dare I say, I suspect it may have been stocked by a native or at the very least *for* a native. It's exceptionally rough and crude.
ANYWAY what I am trying to identify initially are some markings. The chopped barrel is clearly some kind of US musket barrel, I'm guessing from an 1816 but I don't know enough about the markings to be sure and the barrel can not be removed from the stock to see what may be underneath. I can remove the lock and there is only a very large "L" stamp, very deep, on the inside of the lock. The lock was cleaned up a bit inside for function, again more on that later. There is faint "XIII" marking on the inside of the bolster which is surely for assembly. The lock to me looks like some kind of trade gun lock but again, not my area or period of specialization. The frizzen is a very old replacement with a brazed sole, and the cock is a replacement from the 1970s or 1980s because initially the gun was found with only a broken cock and the original piece is no longer at hand. But, the rest is definitely original and again, it has not been reconverted.
You can see that the "JM" stamp on top of the barrel is also repeated on the underside, visible inside the lock mortise. The barrel was at some point heavily filed around the breech area and there is no readable date on the breech tang although I do think there is a remnant of a date there. I simply can't read it, again vise and file marks.
How easy would it have been for someone to get a US musket barrel in the 1830s give or take 10 years? And by that point, I would expect percussion as a restock but I can not find any evidence of any reconversion, ever, so it appears to have been restocked in flint.
Very curious piece, musketoon or 'buffalo runner' gun since it's a real shorty but I will post more pictures sometime this week. I am told it was brought back east from Oklahoma in the late 1940s or early 1950s.