Sorry, but that is not an original carbine. 19th Century Bubba took a file and saw to a musket (proportions are all wrong).
Ya mean the wood?....or the whole gun?
Its not a musket conversion...Im pretty sure of that
Barrel should be 22 inches long. Serial number is found across the forward edge of the breech plug tang
Thats where I thought it should be. There are marks there but they are to faint to read.
I also just noticed the front sight is marked "SHEARD MARBLE"