The 935 has proven to be a very reliable and tough waterfowl gun. Love mine and have never shot better with any gun.

I can almost guarantee if you are having jamming issues it is because you are over oiling the gun's gas action system. Follow the manual's cleaning directions to the letter. That would be to wipe a thin coat of oil on then wipe it off with a clean cloth which leaves a very light coat on ANY of the actions' moving parts be it in the reciever or part of the gas piston assembly on the magazine tube.

The 935 likes to operate almost dry. Some semi's such as theStoeger 2000 like to operate wet but not the 935. Too much oil acts like a shock absorber and it slows down the action which leads to jamming. I had a hard time adjusting to this myself and had some jamming problems until I cut way back on oiling it( exterior excluded - oil as usual to protect against rust ).