I build this a couple summers ago just for kicks, to challenge myself. It is a 6+ foot long minigun (gatling gun) that shoots industrial sized rubber bands at rates of up to 60 bands a second. Theoretically, it can hold 2000-3000 rubber bands, but, for the sake of my sanity, this has not been tested (reloading is a slow process). The gun works by stretching rubber bands around pegs with a slot in them and then running a ribbon through the slot, when the ribbon is spooled in, the barrel spins, and the ribbon is pulled out of the slot, thus firing the rubber band. The gun Is powered by a cordless drill.