The Carbuncle is a powerful Torgue-alien hybrid pistol that has ammo consumption based on the damage multiplier on the weapon. A x8 means that it will consume 8 ammo per shot.
Projectiles from the weapon only have the Torgue "sticky" firing mode and explode after a short pause and deals the listed damage on the item card. As the projectiles have reduced speed, aim adjustment is required for a direct hit on small or agile enemies; aiming at the ground around the enemy is also viable as the weapon's splash damage can get them to flinch.
A character build that is centered around ammo regeneration is recommended to keep up with the weapon's heavy ammo consumption. Moze is suitable as she has builds that will increase projectile damage, splash damage, and ammo regeneration.
The Carbuncle is obtained randomly from any suitable loot source.