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In the process of modifying my new H20 M4 to be 922R complaint and would love some advice. I love the M4 for what it is and would to love to keep as much of the firearm as stock as possible. But considering that changing the magazine tube requires me to change 3 parts, I'm confused as to what to change for my third item (magazine tube and follower for the first two). Seeing that my options are the trigger, trigger housing, mesa urbino stock, or forends, I was leaning more towards the forends and my reasoning is that I don't want to mess with the trigger mechanism and by luck when I purchased my M4, it was supposed to come with a pistol grip but it came with a c-stock so they sent me a free pistol grip. Having a third grip just seems wasteful at this point. My only concern with the forend is that most I have searched for seems to include m-lok slots and I was wondering if it would affect the ARGO system but allowing more dirt/dust etc. due to the opening. If that is not the case, I would love some recommendations on what seems to be a good forend. Also, I am not against changing the trigger/housing, just haven't found a good enough reason for that yet. Thank you all in advance!

As street said if you go the housing route the A&S is a good option. For forend if you want to keep a stock look but have it count towards 922r you could always do a US made replica. FFT makes one that’s good enough for this. https://freedomfightertactical.com/products/the-freedom-fighter-tactical-922-compliant-forend-for-the-benelli-m4-shotgun-black If you want something a little fancier there is Agency Arms or Briley. https://www.agencyarms.com/benelli-m4-compatible-mlok-handguard https://www.briley.com/p-63643-briley-3gun-m-lok-handguard-benelli-m4.aspx As long as you aren’t using an MLok slot that rubs/blocks the Argo system you are fine. I know some people also Dremel down the exterior of MLok cam to get clearance from the system if they want that specific spot.

I would swap the trigger housing for an A&S with a loading ramp . https://ansshotguns.com/product/enhanced-trigger-guard-benelli-m4/

I own a Genesis Arms Gen-12 shotgun. It is solid build quality and to me is superior vs. other mag-fed shotguns such as the VEPR 12 or M26 MASS..both of which I have some time behind. I really enjoy shooting the Genesis Arms 12, particularly the AR-platform mechanics & ergos that provide familiar handling. I’ll spare this forum of my own user-experience along with any comparisons, advantages/disadvantages vs. Benelli M4. Having said that..if both the Benelli M4 & Genesis Arms 12 are sitting next to each other fully loaded and I can only choose one to take with me..it’s an easy & quick decision..the Benelli M4 all day & every day.

Here are some pics