I have a Stoeger M3500 that I bought back in March. When I was running my 3.5 inch turkey loads, the plug only let two shells in the tube and one in the chamber as it should. I now realized that with 2 3/4 inch dove loads it allows three shells in the tube and one in the chamber. Does anyone have any ideas of what I can do to plug the spot for that last shell to only have 3 total?