So lemme get this straight... he's built a gat that's bound to weigh about the same as your average Ox, it operates on a ridiculous pressure and only shoots at about 18-20 bps.
How about just using 'a room clearing' shocker?
Oh well good luck to the fella, for all out mentality he gets the lifetime achievement award, plus it is pretty impressive compared to other 'paintball miniguns' I've encountered over the years. what ever floats your boat eh?