I am an avid waterfowler, and I have had my Benelli for sometime now. although with some problems as of late.
First it is a H&K SBE ser# U0530_ _
Last year while in Canada, goose hunting, and I had some miss-feed's. I degreased the entire action and spayed a LITE coat of Rem. oil on it. That seemed to help for awhile.
Since then however it has been getting more and more of a problem. A friend said something about my return spring, so a started watching the gun when I had problems. Indeed, that was the problem. The rotary bolt was not rotating to it's needed position.