Before I start, please note that this DOES need improvement, and I meen it really does. But it works, so... yeah...
Also, you may have noticed it can also be a rubber band gun (title).. well to do that you just leave the blue piece off and do NOT cut the rubber band. You would turn it about 0.5 turns and release. The wheel will spin and launch the rubber band.
WHAT YOU NEED:
1 large yellow gear.
1 orange straight connector
5 Yellow (or grey) 5-way connectors
1 purple connector
1 blue connector (the purple connector and the blue connector should be able to attach without other pieces, but do NOT attach them yet... ;)
3 red (or tan) rods.
2 Yellow rods.
2 blue rods.
1 red (or grey) 3-way connector
2 tan clips.
1 rubber band (cut)