Check out this insanely cool custom made NERF Rival minigun! This insane gadget is built by Captain Xavier and it can fire up to 20 rounds per second, and up to 2000 rounds from a backpack ammo supply.
Check out the video below which will show you how this NERF Rival minigun was created and it even comes with a firing demo that starts at the 18-minute mark. It is super cool and I want to get my hands on one.