Flickr user emilyskeith has a boyfriend who knows she loves Portal. Knows she loves to cosplay. Knows that, should she ever feel the need to cosplay as Chell, she'd need a suitably authentic ASHPD.
So he made her one! A real one, made out of heavy, real materials. Calling it amazing would be understating it so bad you should never, ever call it amazing.
Portal Gun [flickr]