Black Bart's Bane

 is a unique B.B. Gun.

It can be repaired with B.B. Guns.

Availability
This weapon cannot be found anywhere in the game and can only be obtained via console.

Trivia

 * Its name is a reference to A Christmas Story. Ralphie, having just received his new Red Ryder BB Gun, takes aim at a target across the yard and mumbles "Okay, Black Bart... now you get yours!" A similar reference to A Christmas Story appears in the series previous entries,  in the form of the Red Ryder BB Gun as well.
 * Also, It could be a reference to the Welsh pirate Bartholomew Roberts who's nickname was Black Bart, or (more likely) to the American outlaw Charles Bolles.