That's from the old, sadly no longer present,
http://www.thegunzone.com/glock/glock-gag.html Birdman Weapons Systems web site. The best was the .50 caliber tactical nuclear round fired from a pistol. That was complete with video of it in use. Naturally, all was a hoax, and very funny.
Of course, more than one politician wanted to prohibit these non-existent weapons, here's the Richmond, VA example of that.
http://www.freerepublic.com/forum/a3b2df7711c0f.htm