After thinking about this for a while. I’m thinking the shells are the problem. I reloaded many shells over the years. I played with some American Select powder some years ago. I had the same issues with an 1100.
I’m really not sure what else it could be. Interesting that it’s olny happening with this Benelli.
I’d try some different shells.
I was only a spectator, watching the bread burn.
Nothing left but the crumbs.........those were swept under the rug.
Ok, now back to the topic at hand. Jimmy' I might let one of my pieces go, would be the hammer if anything.
Dependent upon the stock, you need to replace three or four psrts that are made in the US to be able to legally install a seven round, extended magazine tube. Research 922 compliance. Here is a link to the information on FFT’s site
https://freedomfightertactical.com/pages/922r-faq