Pixie of Dhooms guns. These get even more powerful when synergized due to power off the frame found here: https://overframe.gg/build/186109/
You can take a sleight hit by running Viral instead of Radiation to synergize with the guns innate slash bonus, choice is yours. The open slot allows you to move your elements around easily enough.
Immortal Pixie found here: https://overframe.gg/build/152320/
Dhoom Pixie found here: https://overframe.gg/build/186109/
Updated: Includes the new galvanized mod for even more pew pew.