This is design your own land though:
The 400-volt semi-automatic Gauss Rifle is what’s known as a multistage coilgun. It shoots 5.7-mm steel ammunition, from a built-in 8-slug clip. Priebe did his best to explain to us non-weapons-makers just how that ammo is fired.I'd think that would hurt.
“You charge a capacitor (high voltage preferred), and discharge it through a coil made of copper wire,” he said. “You will get a short electromagnetic pulse, which pulls the slugs through the coil. My rifle holds four banks of capacitors and four coils ... at the entrance of the last three coils are contacts made of spring-wire, reaching into the barrel. When the projectile touches, the pulse discharges and the coil accelerates the projectile, pulling it through to the next coil.”
This results in the slugs leaving the muzzle at a claimed velocity of approximately 100 meters (328 feet) per second.