This video teaches us the method to make a portable gun. You will need scissors, tape which is optional, elastic band(the thicker the better), clip and a pen. Cut the outer case of pen with the scissors in the front and back. Cut the front part of the case at a point where the opening is large and the pen can easily slide. Clip the elastic near the front opening of the pen. The free part of the elastic will be used to fire the gun. Take the pen out at the back and pinch the pen and the elastic at the back. Take the pen back with the elastic, aim it and fire it. This finishes the task.