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Homemade Hand Held Railgun

YouTube user "Xtamared" built a partly 3D-printed railgun that can fire aluminum or graphite projectiles at over 250 meters per second. The aluminum "bullet" put a half-inch dent in a steel-backed plywood target. http://www.engadget.com/2015/10/19/3d-printed-handheld-railgun/ #tech

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