Airsoft Shotgun to M4 magazine adapter

This allows you to use standard M4 magazines on airsoft shotguns that use the shell type cartridge. It was made for the Franchi 3 barrel shotgun, but will fit other makes as well.
You will need a small bolt and pen spring for the magazine clip.
This is version V, and is much reinforced over the older versions, and uploaded as separate files.

To assemble, the shell needs to be glued and screwed through the holes provided, I use a drill bit to keep the shell and main housing aligned while I'