Prototype Railgun

 is a gun that fires fast-moving piercing rounds.

Trivia

 * This weapon is close in appearance and function to the Asymmetric Recoilless Carbine-920 railgun of the Halo Franchise.
 * Similar to the Railgun, it also shares a close resemblance with the man-portable rail gun from Metal Gear Solid 2 and 4.
 * The weapon's description is a reference to the MAC cannon from the Halo franchise.
 * The weapon's description ("DANGER : HIGH VOLTAGE") is likely a reference to Electric Six's single Danger! High Voltage.