Now this is what I want for Christmas! Forget that sweater and tie crap. This bad boy is built from the Nerf Vulcan EBF-25 (which I have seen in person – pretty cool I must say). It tracks movement using an infrared sensor. Rick Prescott built it using a motor, battery pack, in addition to the sensor. It even has semi or full automatic modes! You can check the video below. Granted, this is the first time we’ve seen an automatic gun…but this package is nice and snazzy and doesn’t look terribly difficult to emulate.