Serendipity? Me thinks not.
I have a Benelli M4 shotgun. The magazine tube only holds 4 rounds due to some silly regulation. However, you can replace the magazine tube legally IF you follow some specific regulations listed here.
My main concern was doing the work myself to actually replace the magazine tube. When I bought the shotgun, I could not find any information about how to do this. However, in following another YouTube link from a post on this forum, I found this video (How to Install a Full Length Magazine Tube on a Benelli Shotgun) which was apparently published last week. I am feeling much more better about doing this. (This guy is much like me.)
Coincidence? I don't think so.