BTW, 1 gun I would LOVE to shoot full-auto.. I believe it is called ‘mini’.. I think 2000 rounds per minute.. but I will probably never even see that in person in my lifetime :p
(BrrrrrP.... BrrrrrrrrP... Brrrrp {some target shredded into a billion pieces ;)} ) ;^D
http://en.wikipedia.org/wiki/XM214_Microgun
Including ammo, it weighs in at a hefty 84 pounds. Not remotely practical as a man-portable weapon, the movie "Predator" aside...