PARTS, HOW TO,
I have made an awesome twin Gatling gun that uses a mechanism that I don't think anyone else in the world has used.I am planning to make an instructable for it.
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The disintegrator, built by a guy I know online, is a great exampleDisintegrator Construction It's a twin gun, powered by electric screwdrivers, firing 2400 rounds bands a minute. The construction section explains in enough detail how it was built, thuogh you'd probably have to adjust some of the construction to your particular materials.
Here is a good and easy to make one!https://www.instructables.com/id/Knex_rubber_band_gun_turret_1/