oh yeah, i have been in a few airsoft gearboxes before, but its just the issue of the barrel length and head speed, or even the sheer volume inside, heres a quick diagram [img=http://s13.postimg.org/adw2bks0z/gun.jpg] i couldn't use springs much like a airsoft gun as the springs are gonna have to be...

hey guys , glad i found this post ! god there is such a lack of info on vortex cannons .. anyways to the point, im building a costume that requires two cannons on the back, (heres a pic) http://www.gundammad.co.uk/images/D/ZD063big1.jpg i wanted them to fire but cant have projectiles, or compressed ...