Video and comments
Metal Storm Ltd is on the verge of developing a working prototype of this weapon. I also heard that China is eyeing this piece of tech, where they have monitor and try to acquire the scientist - J. Mike O'Dwyer, for the past decade. (Link) to the Wiki entry.
The weapon is like super version of shot gun, robotcop era one. 16'000 rounds per second, no jam! Wicked!