K'NEX Machine Gun (Does Not Use "Barrel Per Bullet" Design)
Background: Uses a rack and pinion system to draw back a firing pin to launch projectiles(firing pin not shown).
1. Crank (black rod) will be turned, spinning the pinion, which in turn draws back the rack. First picture shows the racks in default position. They are locked in place against the pinions by the yellow connectors stopping the orange connectors (center).
2. Rubber bands attached to the racks pull them inward, but is stopped by the yellow connectors. Once it reaches the end, the rubber bands pulling the racks will pull them inward suddenly. This will free the racks from the pinions, so turning the crank will not pull back the mechanism any more.
3. Once the racks impacts the front, the force of the impact pushes it against the angled yellow structure, thus resetting the racks into default again.
Basically someone build this so it works well, por favor.