From what I have read you are the lucky owner of a rare U.S. musket. I hope you are able to resolve the feeding issues with it. My carbine was made after the government contract for your musket. It has some parts marked with KSM, a government inspector. I guess Winchester used up the leftover contract  parts on civilian rifles. These rifles seem to have been popular with revolutionaries, both russian and mexican. They were also favorites of the Texas rangers. I think they are cool pieces of history.

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