How do you get the shishkebab in fallout new Vegas?

Answer 1

The vanilla shishkebab is sold by multiple vendors:

-Quatermaster Bardon at Hoover Dam

-Blake at the Crimson Caravan (at lvl 16+)

-Mick at Mick & Ralph's

-The Great Khan Armorer at The Greak Khan Armory

It can also be found on high level enemies; such as the Viper Leader.

The Shishkebab can be found in the Old World Blues & Honest Hearts DLCs on enemies

A unique Shishkebab called the Gehenna can be purchased from the Gun Runners prodived that you have the Gun Runners Arsenal DLC.

Unlike in Fallout 3, you cannot craft the Shishkebab.

Answer 2

it is a custom weapon you must build