Brian Henderson here with my newest hack: I mounted an airsoft machine gun to the top of a remote control car! This is a complete tutorial, showing you how to make your own airsoft rc car from beginning to end. It makes for a great afternoon project. You'll even get to add a "fire" button to the remote control to fire the airsoft gun! Neat!
Parts list:
TIP120 NPN-D Transistor (RadioShack Catalog #: 276-2068)
1N4004 Micro 1-Amp Rectifier Diode (RadioShack Catalog #: 276-1103)
1k Ohm resistor (RadioShack Catalog #: 271-1321)
6v to 9v battery (I used a 7.2v 2000mAh Ni-MH battery pack I got on clearance for $9)