A small circuit allows my airsoft M14 chassis to be fired slowly, or fast. I'm making single and dual miniguns, in short and long models. these are motorized dummy guns that spin at up to 900RPM, and are 18volt powered. There is a hollow shaft in the middle to allow somebody to put any airgun, watergun, bubble-gun, whatever, inside so it fires out the center axle. http://www.killbuckets.com