You used slightly incorrect language and terminology in your OP...
So you are saying the gun simply is not unlocking when trigger is pulled so you cannot cycle to fire the next round?
Is it "recoil" operated or is it "trigger operated" like my 500 mossberg?
If the latter, i would remedy the same issue on mine with a thorough cleaning and relube... If I find a notch or something hanging it up I could smooth it then...
Brent
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