Portal gun?

[mewchoc]

Im looking into building a Portal gun for my next Game cosplay at Fan Expo 2011
Ive seen a few ways but want more imput.

[RollingStar]

Oooh~ I've seen a few of these around. I prefer the bottom model to a lot of the others I've seen online. If you want more ideas there are a lot of examples on youtube. There's one gun that can even switch back and forth from blue to orange.

http://www.youtube.com/watch?v=6sY33WidQhc

Not sure how they made that one, but I know they're selling it. Expensive as hell though.

[Yineth]

http://www.instructables.com/id/Hey-an-introduction/

Might want to consider this then