Railguns are simple mass accelerators requiring physical contact of the projectile with guiding rails. Projectile closes the electric circuit and induces electromagnetic force that propels it. Compared to more complex coilguns, railguns are relatively simple devices capable of delivering impressive rate of fire, but they lose a lot of efficiency due to friction of the projectile and are prone to malfunctions.

Railguns require kinetic ammo storage to function.