Homemade BB Gun

here is my homemade springpowerd Airsoftgun.
it shoots around 200 m/s i think. you can see in the images it shoots trugh cds.
i can make a how to instructable if somone want s me too.
I will be making a upgraded soon whit a magazine, and smaller.

SEE THIS LINK FOR A DEMONSTRATION http://www.youtube.com/user/sabladask?feature=mhum#p/a/u/0/ff4Q81E9f4w