A multi-barrel machine gun. It's unwieldy, but once it starts firing it fires very fast. Where most self-loading guns are powered by the energy from the gunpowder, the minigun uses an electric motor to rapidly cycle cartridges through the weapon.
"Charged-shot rail-assisted lance weapon. Fires a single charged shot at high velocity."
"Incendiary-shot mini-artillery device. Mechanoid-built."
Heavy charge blaster
"Charged-shot blaster for area suppressive fire. Mechanoid-built."