A weapon of the Watchers that uses electromagnetic force to launch high velocity projectiles. The projectile normally does not contain explosives, instead relying on the projectile’s high speed and kinetic energy to inflict damage. This weapon, when not attached to an ammunition printer, has a projectile which is a vortex generated ion ball. This can be fired short distances, and therefore requires no solid ammunition.
For more serious firepower an ammunition printer can be added to the rail gun. This allows for rapid printing of solid compound projectiles which add range to the weapon. Additional doping bags allow the printing of a range of explosive projectiles.
However in non-combat situations Watchers preferred to do without the awkward feeder and printing units and keep it in ionic mode.