Pretty much that is what they told me, Madcratebuilder , although that does not address the rifling. I have a shotgun that has a bore that is
bright, shiny and free of any pitting lol

I assume you are holding onto the correct furniture and small bits for the right reciever and barrel to turn up. I will keep my eyes peeled for you (thinking about it, isn't that a disgusting phrase, or what?) as I seem to be attracting 1941 Long Branches at the moment.