Introduction: Mini Pen Gun
It is very cheap and strong.
It is very easy.
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Step 1: Material
pens, springs, tube,stopper and bullets.
Step 2: Add Springs + Stopped + Tube
Add spring + spring for make a big spring and paste the stopper and tube.
Step 3: Screw and Play
Screw the stopper on the pen and load the bullet.
For fire, pull back the bullet and then leave.