The narrator says that air friction ignites the orange coating on the front of the bullet to produce the tracer glow. But that coating is simply paint, put there to ID the tracer rounds. The glow comes from a phosphor in the REAR of the bullet (inside the cartridge before firing) which is ignited via a time-delay coating by the gunpowder. The glow is for the person firing the shot to adjust his aim, which is why the glow MUST come from the back end; if it was on the front, only the target would see it. And if the coating burned that easily, it would ignite as the bullets rubbed against each other during shipping.