K9000 mod - Mentat chow is a weapon mod for the K9000 cyberdog gun in the Fallout: New Vegas add-on Old World Blues.
Increases the K9000 cyberdog gun's rate of fire by 40%.
Can be bought from the Sink Central Intelligence Unit after obtaining the "Mentat Chow" holotape, which can be found in the X-13 research facility.
After buying the mod, you can go back to the X-13 research facility and download another schematic. You then can buy it again from the Sink Central Intelligence Unit.