I had a Parker 12g. once that had a similar issue. It shot fine for a while and then wanted to open hard as the pins were hanging up in the primers just a bit. Actually, it was really only one side that was giving me issues. The end of the pin had gotten a bit messed up somehow. I just removed the hammer and reworked the end of the pin back to a round tip. No issues again after that.
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B. Dudley
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