One more thing to try, just to eliminate an unknown; try dry-firing the gun. Make sure the slide release isn't partly hanging up with factory gunk after the shot, and keeping the bolt locked. I've never experienced that, but in a system as dirt simple as an 870, there are only so many things that could go wrong.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.
--Winston Churchill
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