EG-7

The EG-7 was a model of blaster produced by BlasTech. Jeigh Esse used a modified EG-7 known as a polarizer.

Behind the scenes
The EG-7 was created by Chris Cowdrill, a Star Wars fan, for the backstory of their Jeigh Esse entry in the Design An Alien contest held in the Star Wars Galaxy Magazines and as such, exactly how canon the weapon is remains unclear.