Last week I decided to try making an NXT gun using the spinning wheels concept, since the NXT motors are more powerful than the RCX ones and can therefore spin the wheels faster. It came out pretty good... it can shoot 1*5 beams (hence the name, "Beam" Weapon :P ) over 23 feet. The magazine has a capacity of 10 beams, and can shoot single or rapid fire.
Below is a video of the gun in action... a touch sensor is used for the trigger, and a motor pushes a beam into the wheels to launch it.
Below is a video of the gun in action... a touch sensor is used for the trigger, and a motor pushes a beam into the wheels to launch it.
-Jonathan