My uncle and I were hunting our usual spot when he came out with this. Correct if I'm wrong but I do think it's a Burnside plate and hammer.
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Wow, that's certainly a good find! Congratulations to your uncle. Was this from a Civil War site?
I believe you hit the nail on the head!!!I was looking around online (rock island auctions) and saw a few hammer shotguns with that same tombstone shaped plate. Might look into those and see which one has the same pin locations. Most of the Burnsides I saw had a rounded plate.