Do these need to be reset each time by pressing in the back button? I'm hoping unscrew the screw refill valve and add my own direct fuel line. I can machine my own threaded fittings. I know that I'd have to open and close the fuel line valve for it to reset, but the end goal is to have it like a wrist mounted airsoft shotgun for a last min attack. I was wondering if this would be possible. In the end I want to be able to press in the button, refill through my custom line, and then fire again by pushing the back button.

Where did you get that safety at and that shell lever