K9000 Mod - Resla Roil

 is a weapon mod for the K9000 cyberdog gun in the Fallout: New Vegas add-on Old World Blues.

Location
On a terminal upstairs in the X-13 Stealth testing area.

Behind the scenes

 * It could be a reference to the Scooby Doo series as it is called "resla roil" instead of tesla coil and Scooby Doo puts an "R" sound at the start of many words.