"metal storm"

I also bought stock in Metalstorm and lost it all when the company was suspended from trading. It wasn't a lot of money and I still think the concept is sound.
The stacked munitions idea is used in Hollywood to make so called "silent" guns. A firm called Studio Services makes look-a-like pistols with a stack of photoflash squibs in the barrel. The actor fires all the squibs and then moves behind cover, let's say, a trash bin where another gun is staged. The guns makes almost no noise so the gun shot sound is added in post-production. Guns of this type are needed in movie making because most actors are not good with guns and noise has become a serious problem when filming in the streets of Los Angeles.