So, I think I finally have my M4 how I want it. Just got back from the mountains and shot about 300 rounds of #6 bird, 3" 000 Federal buck, 3" Federal slugs, Breneke 3" Black Magic Magnum slug, Federal 8 pellet and 9 pellet 00 buck flite control, Hornandy Critical Defense 00 buck, and Ddupleks Monolit 32 slugs. I am fully convinced that the Benelli M4 is by far the best shotgun currently in existence. I was sure before but now I will accept no other shotgun being anywhere near comparable to the Benelli M4. Here are a couple pictures of my current build and item list.
Briley 3gun Modified Mobil Choke
Nordic Components plus 1 Mag extension
Blitzkrieg Components chevron front sight
Surefire Scout light Duel fuel turbo
Surefire Dual switch Tailcap assembly
Unit Axon SL Mlok switch
Briley 3gun Mlok 13" handguard
15 G10 Railscales in Matrix pattern from 1 slot to 4 slot
Magpul Mlok AFG
Briley Stage Saver
Railscales QDX Sling mount
Vickers Blue Force Gear sling
Airidus Industries 6-round Universal Quick Detach Carrier
Scalarworks Sync/01 mount with Holosun 509T-X2
Briley Trigger shoe
Freedom Fighter Tactical No-Spin 1/2 steel charging handle
Freedom Fighter Tactical Oversized Bolt Release
Benelli Field Stock
Thinking about a couple items that I might consider for it is the new Chisel Machine pistol grip stock, A&S Trigger Housing, and maybe open up the loading port and lengthen forcing cone. But to be honest after spending some time with this beast of a shotgun I dont think I need to do anything else to it. The current setup is beyond amazing and will do anything I will need it to do.