Say hello to my little friend
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If you're interested in purchasing one, check out the Ruff Stuff Air Blasters Motorized Mech Tommy 20 Dart Blaster on Amazon.com. As of right now I have the only review on this product, so please mark it helpful (if you found it helpful).
Technically these aren't nerf brand guns, but they are an awesome addition to any office. Also joining the stable is a Nerf Maverick and a Nerf Nightshot. Soon to come, Nerf Mag Strike (fully auto nerf gun). Yes I am a geek, and no I do not care that you think that also.
Edit: It appears it's actually called the Nerf N-Strike Nite Finder EX-3 Gun