With the M4, is there that much more to clean vs. the M2? I know the military tested it to the extreme to ensure a very low number of failures, even with a gas system. The inertia system from my understanding would not cycle if the gun was pressed up against a wall, too much gear on it, or was held wrong. My understanding is that it will not shoot under powered loads very well if at all, compared to the M4 that will shoot everything.