W.T.F.?? The sear is inside, the AA is external and does not enter the insides where the sear is. Are you stumping for the BATFE? a plant?
It works on exactly the same principal as the "Helfire" and other completely legal devices. It uses the recoil motion to release and re-depress the trigger, simulating full auto, in a semi-auto action, which, by statute, is completely legal. In order for the BATFE to legally ban these they need to take the NFA law that defined "automatic" or "full automatic" back to congress to get it changed to what they want it to say. Until then, the device is legal, no matter how badly they want it to be otherwise....
Your post sounds like a Duncan Hunter Supporter