Co witness m4 or similar

They're going to be thin on the ground here in Canada now that ARs are forbidden fruit, but there are fold down-pop up sights that are designed to allow cowitnessing in the event your holographic or red dot optic fails. They work quite well, as a backup system but you do need a suitable rail setup. Available from a site sponsor, probably best to call them for advice but here's a front sight:

https://nordicmarksman.com/magpul-mbus-3-sight-front/?searchid=0&search_query=popup+sights
 
While not an M4, I put a scarlworks I think it was? mount on a beretta 1301 with a Holosun on it and it co witnesses perfectly with the factory ghost ring and front sight
I’m pretty sure they made a similar mount for the Benelli
 
You could try a Bushnell TRS-25. They are the lowest pic rail mount dot I've found, though not super quality.
Also, run your front bead up as high as you can with spacers, bring up rear as well to zero and have best shot at co-witness.
 
If you want to keep the rail installed and not use a mount directly on the receiver, and are open to a different sort of “co-witness”, you could consider a Holosun AEMS or ScalarWorks Leap mount (comes with various footprints). The riser “gap” has enough space to see thru below the optic and still use the ghost ring sights (it works on some other Benelli models anyway)
 
Another idea is to use a red dot like the Aimpoint PRO that will snap right off in the unlikely event it fails or isn't bright enough. It holds zero pretty well too, going back on.
 
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