The Variable Ammunition Repulsion Impact Spitfire (VARIS) (ヴァリス, Vu~arisu) is a special armament designed exclusively for the Z-01 Lancelot and its successors, serving as its primary means to engage the enemy in long range combat. A revolutionary weapon based on railgun technology, it fires beam-like bullets. By changing the configuration of its barrel (aka. Impact Rail) between Normal Mode (straight beams) and Burst Mode (spherical beams), it can adapt the repulsion force applied on the projectile to fit any combat conditions. It boasts destructive power in a different league from that of the coilgun-based Assault Rifle equipped in other Knightmare Frames.
Lancelot Albion is equipped with two upgraded versions of the VARIS. This new, improved version includes two barrels, one which serves as a machine gun, while the other is used for high-powered shots. These barrels can also seperate to reveal a Hadron Cannon.