Ok this is driving me nuts. It is my understanding that the A.I.R. (advanced integrated REGULATOR) Valve is just that, a regulator. Is it or is it not a regulator? If so, why are people putting rugulators on their automags if it already has one? It's just like having two regulators on a gun! I realize the aftermarket regulators can be adjusted, but what is the point. Is it better to have the second regulator?