Completly Concelable Pen Gun (no Rubberbands)

well this Instructable is a little something I made while I was looking at other pen guns and realized that all of them were rubberband or balloon powered so I thought to myself hmmmm and then it came to my mind that the world needed a better "spy" pen gun. so the next day at school after the test was done it was time to invent

Hot glue gun
Bic pen
screw driver
small screw (has to fit in ink tube)
pliers (optinal for better grip)

just follow the steps