I believe it' s the ejectors. They don' t look right to me but I don' t know how to fix it. I' ve tried to take the barrel off but can' t so I think it' s seated correctly.
You should be able to take the barrel off. I would try and take it off then reseat it and put it back on. Sometimes the ejectors jam inside. Can you see if they are jammed?
Just a quick update. I took it to gunsmith #1 and he fixed it but then I started having problems with it pulling the shells out of the magazine. Gunsmith #2 said it was my selection of shells. Inexpensive Walmart brand. I changed brands and haven't had any problems since.