I have a new 7 shot one piece magazine tube for a Benelli M4 (it was opened, but never installed in the receiver or screwed to anything). This replaces the 5 shot tube and 2 shot "dummy spacer" that comes from Benelli. I purchased it and then decided to use an OEM Benelli tube on my M4. This converts it to 7+1 from 5+1.

https://www.midwestgunworks.com/page/mgwi/p.../1301-XM2BEB407

To legally use this, you need to change out some additional parts due to 922r laws. More info can be found here:

https://freedomfightertactical.com/pages/922r-faq

In my case, I changed the forend, hammer, disconnector, trigger, and follower. That keeps me extra legal by going above and beyond the ATF requirements.

I paid $89 plus freight. Asking $89 shipped OBO.