In this video tutorial, viewers learn how to make a pen gun. The materials required to make this gun are: a pen, tape, rubber band and pliers. Begin by taking apart the pen, leaving it with just the tube. Place the rubber band on the side of the pen tube and tape it. Then pull the rubber band back and place it on the end of the pen tube. To shoot it, place the ammo inside the pen tube. Then simply pull and release the rubber band. This video will benefit those viewers who enjoy making weapons and would like to learn how to make a simple gun.