Flak Cannon

Flak Cannon is an upgrade for the Double Barreled Shotgun.

Advantages

 * Each shot consumes only 1 shell
 * Extremely useful during Episode 5, since fire damage prevents enemies such as Abominations and Incubi from transforming.

Disadvantages

 * Inflicts less direct damage than the Harvester

Trivia

 * In real life, "flak" is military terminology for rounds fired from an anti-aircraft gun.
 * The name "Flak Cannon" for a shotgun-derived firearm more likely derives from an iconic weapon in the Unreal franchise, which inflicts fire-based damage circa Unreal Tournament 2003.