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Is there and instructable for a projectile launcher make from knex that doesn't use rubber band propulsion?

Is there and instructable for a projectile launcher make from knex that doesn't use rubber band propulsion? I know that something like a catapult doesn't but i what something hand held? I would like a shotgun but a crossbow would do.

DJ Radio7 years ago
I know Mepain's crossbow does not use rubberbands, it uses string.