That is pretty cool, but doesn't seem like a viable option for a skirmish gun. Assuming they're using quick disconnects for those fittings, you'd have to pop the quick disconnect, drop the mag, load in another mag, and pop the quick disconnect back on. Tack on the price of WA mags at $100 a piece and it's simply more convenient to stick with the stock mags. Full adjustability of FPS with a regulator, no cooldown, and shot-to-shot consistency is a plus though. Now if only someone came up with an alternative to the WA mags...