bsp212

Cylinder or IC is my preference. Anything tighter and you won’t have enough bird left to eat. Shells are preference but #8 target loads work just fine.

I have this stock on a couple of guns and it is more comfortable and user friendly than the M4 stock, but doesn't feel as robust.

Benelli will tell you the same regarding the 20g vs 12g shell latch for the M2. My guess is the only way to find out is to experiment. The spring and pin locations should be the same so it may be worth a try.

I'm not sure if he sells them with the logo? If that's what you're looking for, Midwest Gun Works is probably your best bet. You may even try eBay?

Try either Midwest Gun Works or get one straight from Rob Roberts.

I haven't pulled the shell catch on any of my M4's to check, but is it by chance the same size as the M2? If so, you can use a 20g M2 shell catch. It's hinged with a spring and will load much easier without modifying anything. Same principle as the Ethos and SBE3 shell catches. I know for a fact this works on the 12g M2s.

http://shophuntingstuff.com/factory-benelli-standard-m4-shotgun-stock-81041/ Shows 7 in stock

Those are made by Briley for Benelli and are used on the Cordoba Performance Shop. They will work on the M4 but require machining a couple of flats into the round button and drilling and tapping the 5-40 set screw. They will probably cover the flag as they are a little on the big side.

I think I may have one. I had a M1 years ago that I pulled the forearm and replaced with a surefire. PM or email me contact info and I'll check my parts boxes tomorrow after work. We can discuss what it's worth to you if I have it.