This handheld coilgun is “capable of launching a .30 caliber metallic projectile at adjustable velocities.” Video after the jump.
The electronic circuit consists of a voltage step-up transformer converter, a Cockcroft-Walton voltage multiplier cascade, a capacitor energy storage bank, a voltage comparator to set the charge voltage on the capacitor bank, an SCR switching section and a single accelerator coil
[via HackedGadgets]