Why is it doing this? I have a brand new Mossberg 930 I purchased as a home defense shotgun. The problem is that it came with a "JAM MY GUN BUTTON" that I didn't know about. That button is the bolt release button. If you have shells in the feed tube, then press the bolt release button at any time, two shells (more if they could fit) will eject from the feed tube into the chamber, jamming up the shotgun, essentially making it useless. This occurs when the gun is in ANY position, with all brands and sizes of shells, at any part of the loading cycle, with a brand new non-modified factory stock gun, with 100% repeatability every time. Needless to say, I'm kind of pissed. I took it to a local gunsmith and as soon as I showed him the issue, he didn't even want to deal with it and just told me to send it to Mossberg. That's how messed up this is.
VIDEO HERE!
Edit 7/24/2020 I received a reply from Mossberg:
"Mike, From what I could see in the video, the gun is working as it was designed.
Sincerely,
Customer Service Team
O.F. Mossberg & Sons, Inc."
Well, just don't touch that button in a tactical situation I guess.