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I had similar problems with my Stoger O/U shotgun. Found the firing pin spring mechanism was rubbing on the inside of the stock. The hammer spring fits into a hole drilled in the stock. On mine, the hole wasn't aligned properly so the spring would rub against the side of the hole. Drilled the hole to a larger diameter until no interference. Problem solved.
Remove the butt stock and try to re-install it when the gun is cocked. It should slide right on with no resistance. If you have to push, even a little, the holes are wrong.
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