I'm having this same exact problem. We've replaced the ejector plate and that didn't work. Can anyone tell me if the OP is talking about grinding down the round end of the ejector plate?
Looking for a used, cheap SBE I barrel. 26" or 28" will be fine. Screw in chokes. Also, since I know a lot of you have quite a bit of experience, I would appreciate any advice on what to look for to be sure a used barrel will fit. The gun is from around 1994.