This 3D-printed, portable railgun fires slugs at 560 miles per hour
by Cory Doctorow from on (#R27R)
David Wirth 3D printed a 20lb railgun that fires copper-plated tungsten slugs with 1,800 joules of energy, firing them at 560mph, with so much force that they vaporize on contact with a steel-backed target. (more")