An update....I was looking at the rib situation this evening and lo and behold the pin at the end of the rib at the breech is not a pin but a 4-40 screw with about an 1/8" of thread counter-bored into the rib. Now I can see why these screws can work themselves loose after 1000's of rounds.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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