I thought if this idea while i was working with some pen parts and office supplies. I was thinking of the Vietnam war and i suddenly thought of the concept of making a gun like the one in the war.
Step 1: Materials
First gather your supplies.you need a round pen tube, a mauler, 2 springs, the end of a click pen, the tip of an ink cartridge, a gel pen ink cartridge with the tip cut off, and the head of a pen.
Step 2: Firing mechanism
put 1 spring into the end of the click pen.Do not put both springs in there at once.This is how you'll start the firing mechanism
Step 3: The barrel
Now put on the pen tube on.This will become the barrel.
Step 4: Firing mechanism(cont)
Now put in the other spring.You are now done with the firing mechanism.
Step 5: The stand
Now put on the mauler (black thingy).This will become the stand.i forgot what its called. My apologies if i get the name wrong.
Step 6: The missle
To make the missle take the pen tip and put in the pen head.Then take the gel pen cartridge and stick it in.Then tape it.
Step 7: Done!
You have now completed the NVA pen cannon.To fire put in the missle, push it down and let it go.If done right it will shoot up to 25 ft.