Mine is going back to Mossberg tomorrow.
It will consistently fail to release a shell from the magazine tube.
Upon close inspection and comparison with another 930 JM Pro, the "rear shell stop" has a small ridge left on it from manufacture, that should have been removed. Not sure if this ridge is THE culprit, but it's going back.
I have put about 350 rounds of various types and have rarely gotten through an entire tube of shells without such a failure.
God gave you a soul.
Your parents, a body.
Your country, a rifle.
Keep all of them clean.