That pin removes by the small retaining screw in the water table of the frame.
Likely the spring for that pin is broken or gummed up. However, the unhooking slide in the trigger plate has a much firmer spring that would normally overpower that smaller spring on the pin. Chances are the the root cause is with the slide in the plate.
The gun sounds like it could use a good thorough cleaning.
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B. Dudley
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