So how do you test an AEG? Subject it to abuse, as simple as that. And that's what crazyNCman did to the Lancer Tactical M4 AEG as he used an 11.1v lipo battery to fire off as many magazines until the parts start failing due to vibration and stress on the gearbox. He even tossed it! As to how the US$100 AEG took the beating, better watch the videos below.