Sleeve Gun
Obviously this is not for use with a real gun.
The video's description makes little sense when translated from Japanese to English, but here it is for what it is worth ...
Nervous prototype parts have been assembled from the factory, complete reconditioning. We are currently in volume production. First I can only say with one hundred pieces. Is expected to release at the end quietly. But while their work and thus can get items in a dream, or tears and feeling 申Shimashou. Really, is not it what I wanted this occasion. And work is better. Stop arm is fixed to a leather belt, wide adjustment range Berukurotepu adopted
[ Many thanks to Heath for emailing me the link. ]

Ok, the translation was one of the funnier things I have read recently. Thanks for posting it!
Too bad the the gun is so small that it cant stop a fly flying to you!!! LOL
Agent Jim West had a very similar rig on “The Wild Wild West.” With a Derringer, I think?
Like everyone else, my first reaction was ‘Oh kewl!’, but then I thought about it pracitcally and realised it’s useless.
What could be more embarrassing then meeting someone for the first time and when you go to shake hands, a .32 ACP flies out of your sleeve? Talk about a faux pas, they’d never let you back into the Yacht Club after that.
Isn’t making a sleeve-gun without paying for an AOW tax stamp a federal felony?
here’s instructions to make your own. With a toothbrush…
http://www.youtube.com/watch?v=2XZWi7dRxws
Is that thing a draw slide? Interesting.