Like the geth plasma shotgun, the Spitfire is not a true energy weapon. Instead, the minigun magnetically flings clusters of superconducting toroids. These donut-shaped projectiles and designed to shatter upon impact, arcing electricity between the fragments and flash-converting them to plasma. The gun's punishing, automatic blasts impact with the heat of a cutting torch.
The weapon's stopping power has garnered the attention of both Alliance and quarian intelligence, who theorize that the Spitfire may have been designed to destroy other geth. Enough Spitfires have been found in the field to suggest that the weapon is out of the prototyping stage, and that a schism among synthetics may have forces them into production.