A Space Age weapon that is the bases for other, more powerful weapons.
Rail Guns use Electrical forces in place of gun powder to move a bullet down a barrel. Due the difference in power, normal bullets are not used, instead Slugs are used. Slugs are large hollow bullets that are designed to flatten out on impact, ensuring all the kinetic force is transferred into the targets body.
Varies per design and technology, but the simplest is a pincer shaped gun with electromagnets on the side to move the bullet.