very epic win, and your right this isn't a gun in anyway it's just a rocket firing itself from the inside of a tube which is part of your prop, the rocket would fire without the "gun" so you didn't make a real gun. freakin awesome, i love that dude's hair btw.
You know, he could have actually wired the fire controls and wires into the trigger assembly... I actually thought about something like this, but my idea was to put it in a Jango/Boba Fett Jetpack. My only problem was not burning my neck and head