I'm sure that Halo assault rifle you mocked up for Halloween 2004 was nice and all. But unless it's also a fully functional Nerf gun that holds three magazines and "a bunch" of darts, you lose. Here's the video proof.
The weapon was created by Halo cosplayer Moz, who combined a cheap plastic toy gun, a Nerf rifle and some good ol' fashioned ballistics know-how to produce this monster. Honestly, we should all just be glad this guy's not in our paintball league. [405th via Kotaku]