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How to build an airsoft artillery piece
Make a base block.
Use a good, strong piece of wood about 2 feet (0.6 m) by 2 feet (0.6 m). This will be what everything else is built on.
Get a 2 by 4 approximately 4-5 feet (1.2-1.5 m) long. Attach this to the top center of the 2 by 2 foot board with the end of the 2 by 4 matching up with the opposite side of the board so now it sticks out.