Cut each chopstick and toothpick to length as shown in the photo

1 Drill holes in each lever and insert stop pins (3 mm high),
then glue pivot bars to each lever

2Drill holes and insert the stop pin into the frame, then glue the barrel to the frame

3Attach the muzzle bar to the barrel tip using a rubber band

4 Place the levers on the frame, using the pin protruding at the top, and wrap a rubber band around them as the lever spring
(The pivot bars are positioned by the stop pins, which prevent them from sliding forward)

1. Load three rubber bands in order, starting from the lowest lever
2. Lowering the top lever fores the first shot
3. Continuing to push it down engages the second-stage lever, firing the second shot
4. Pushing it down further engages the third-stage lever, firing the third shot