My question is the Nova’s are 4+1. I called and ask Benelli if I can add more and was told no. The Mossberg I looked at is 8+1 590A1. for those that own them any way too had more?
Not that I know of.
I like my SuperNova, but there just isn’t a lot of aftermarket support for them.
Nordic Components makes an extension for the Nova.
Edit to add: Briley also lists some for the Nova
I you used the Nordic on a Nova?
I have not. I have a Remington 870 for defensive scenarios for this very reason. I have heard that the Nordic works well on them, but have no personal experience.
A person could certainly add a mag extension to a Super Nova. When one does, it will look like the photo below. 
Details on how to do is is contained in this SuperNova mag extension write-up.
If you are looking for a nice quality side saddle for the SuperNova, those can be had as well from Mesa Tactical. It comes with a Picatinny rail built in.
