The is a ballistic explosive weapon used by the Raider class in the game Tribes: Ascend.
"Designed for use against armored defenses, the ARX Buster fires a triple shot of sticky explosives." In-Game Description.
Operation
The weapon fires three grenade-like projectiles in quick succession. Each round deals 600 damage at point blank range with a very short fall off. The projectiles also stick to the first surface they come into contact with, including players/vehicles. The Arx Buster has very long range though it fires in a short arc.