I've got two guys in town that may be able to help. One of them has been gunsmithing for several decades and the other "specializes" in military rifles (so he may not be much help). Everything around here, except WalMart, is closed on Sundays so I'll do some more web searching.
The more I look at the rifling, the more I'm wondering if it's worth spending $25-30 on it for a firing pin. It may end up hanging on a wall. I'd still like to take it apart and see what makes it tick. Just want to be sure I can put it back together.