I recently came into the above shotgun. It had been kept in a shed for quite a while. There was a lot of surface rust with a little pitting going on. I paid nothing for this gun, so whatever I do will be the only cost. Also, it did not have the magazine. For those not familiar with it think the Marlin Goose Gun.
Now for the problem. I cleaned it up as best I could. Got all the rust off the surface and cleaned the bolt and rest of the action as best I could. When I took it to the range to test it, the shells would not extract. When I got home, I removed the extractor and cleaned it and the bolt again. The extractor appears to be in good shape. I also cleaned out the little holes to the side of the chamber where the extractor rest. Using the shells I had fired at the range I still cannot get them to extract.