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And yet another https://www.speedshooter.com/product/dmw-benelli-speedbar/

Here's another version https://cpwsa.com/product/benelli-carrier-rapid-release-tab/

That's not OEM, I've always heard it called a "bolt release tab". https://rxarms.com/products/benelli-m4-parts-and-accessories/benelli-m4-bolt-release-tab/

You can mount a rail to the OEM handguards....did it many years ago when the forum old guard were spitballing solutions. T-nuts work.

Good questions. I am currently in your potion as well and in the middle of a cool build for my M4 and I am kinda stuck on the trigger issue as well. Not sure if I should send it in or have my gunsmith do a drop in etc. Would love to hear some more insight from some guys on here that are further down the road than us. I know some guys have talked about it, but I just love talking about it even more lol.