[Yo-Yo]

I remember it. Fact is I tried to find a youtube video to put alongside it for comparison. Unfortunately, the only video i could find was pulled by youtube for copywrite violations.

2008 SHOT Show: http://www.youtube.com/watch?v=D99NHb6B03s

It's not for sale, it was only a prototype. The Discovery Channel program Sons of Guns built a similar weapon in one of their episodes:

[OneVike]

you have freepmail

[FourPeas]

I remember that episode.