Some engraving on that frame!
Looks to be an aftermarket ejector system. The slots would be for trips sticking out from the forend and the pins would be what trips them.
Deffinately an addition to an extractor gun since this frame has an extractor style roll joint in it.
I believe I have seen other guns with aftermarket ejectors that utilize pins just in from of the roll joint pin. But I do not know of what type they are.
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B. Dudley
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