The top piece in your first picture, that you call a "firing pin seat" looks like a retaining 'gland nut' which, on other guns such as early Parker hammer guns, holds the striker in place. It looks to be threaded... what does it thread into? What do the lock plates look like on the inside?
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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