This is the Thursapar from Fallout 4. Added with the Nuka World DLC, this simple water gun was meant to be a kids toy, but what if you cranked it up a notch? To find this modification, you'll have to head to the Nuka World Power Plant and restore the power. Once you've done that, you can head to the Nuka Cola bottling plant and unlock this door. Here you'll find an experiment lab for everything Nuka Cola. And behind one of the doors is the Project Cobalt's Chimatics. Using these chimatics, you can now modify the Thursapar to shoot weaponized Nuka Cola in three variations, whether that's normal Nuka Cola, Nuka Cherry, or Nuka Quantum, each with their own damage levels. There's also bonus points for pairing this weapon with the Bloody Mess and Demolition Expert perks for bonus damage.