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At one point I had every single tactical shotgun along with an SBE2. I got bored and started mixing and matching different parts and end up with that franken gun. I can give you a good idea of what can interchange and what can't. Basically: M4 entire front end M4 bolt Assembly M2 Receiver M2 Trigger Group Wolff Extra high power hammer spring (this is very important!) M3/Supernova Comfortech Stock (P/N 61176) Thin charging handle (a regular M4 handle would not work) All that together you got what I have. There's really nothing from stopping you putting on a comfortech stock to a regular M4; consequently if one was to do so the edges of the grip would not line up. You would also need a M2 trigger guard on the M4 receiver. The few friends who have shot my franken gun like it better than the regular M4. It is lighter but the weight is shifted more upfront because of the aluminium Raffaello recoil system I put in it. I had the 5-position plastic stock on it a while ago. The check riser works well with the SRO.

I like them all. But definitely my frankenstein M4 with the comfortech stock. Trijicon SRO, and Raffaello recoil system is softer shooting than my M3.

Sold out now, but you can find the NP3 coated version here. He's pricey, but you do get a very quality piece of work. GL in your search.

THE aluminum trigger guard went out of production years ago, sadly. Take-offs are about the only way.