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Step 1: The Materials
1 1/2 pen tubes (non clickable),an ink cartridge, rubber band an a roll of duct tape.
Step 2: The Body
Take the 1 1/2 pen tube and a piece of duct tape and put the tubes together.
Step 3: The Rubber Band
Take the rubber band and wrap it around the tube.
Step 4: The Finish
Take the ink cartridge and put it in the tube and you done.To fire take the bolt (ink cartridge) put the rubber band on the back of the bolt pull back and fire. And if any one get hurt by this it's not my fault.