Receiver variation question
I was looking at Ron Scores album and ran across these images of the receiver of his GH(?) grade 12ga on a 1/2 frame. Interesting gun, what with the extra engraving and checkering. But that is not what caught my attention. Observe in the picture the slots cut in the joint end of the receiver, and the pins that are on each side near the pivot pin. I have seen this before but I don't understand why this feature was used. Any help?
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