Having seen now Nishas Skilltree I am a bit afraid of the potential the Fibber may bring to the battlefield. Specifically the version with the bullets, which shatter into 9 after hitting a surface, which made Gaige with only Close Enough and Anarchy a maniac of a beast (or was it a beast of a maniac?).
With the capstone of her "Fan the Hammer"-tree and the ricochet skills of her "The Riflewoman"-tree (and some additional) this could be the second coming of this build...but this time with 2 guns. Only her Action Skill might lose some meaning with this, as this Fibber requires you to not hit the enemy with the initial bullet (an exception to this is the "The Riflewoman"-capstone).