Picture of BIC mechanical pencil gun with triger!!
This instructable is a mod for your BIC mechanical pencil gun
DISCLAIMER- I take no responsibilty for what you doo with this or any injuries sustainded during construction or use.
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Step 4: Cocking & Firing

Picture of Cocking & Firing
Once everything is attached pull the piston with the elastic attached and open peg and slide piston in so it wont misfire and blind your sister.

Step 5: Ammo

Use airsoft ammo(plastic bbs)
You can try to make your own ammo just follow the link Free BB ammo
You can also use anything that will fit in the barrel (though the results vary.