well thanks you all of your guys' help i have finished my mini pneumatic pen gun!! i have yet to test it with a projectile though..i will do that tomorrow [/img]

jakethebeast, you said its fairly dangerous with unregulated co2, what if i used this:
http://www.strykeairsoft.com/shop/index ... ts_id=508
?
Thanks for all the feedback on this!

thanks for the info!!

haha...i had no clue they were pressurized at such a high pressure...not safe but then again what is safe that's fun??

for all the guys asking about an air source (myself included) couldn't we just use a CO2 tank?? like one of the awesome gadgets that my bike store has is a CO2 tire re-filler and its basically a threaded refillable CO2 tank that you put on this special valve that is included.
if anyone has some ...

I am sorry if this seems stupid to anyone but I am new to making pneumatic pen guns...how exactly does this work?? do you have to pump it at all?