A mass-production mobile suit created by the League Militaire, the LM111E02 Gun-EZ can trace its roots all the way back to the test mobile suits made for the development of the LM312V04 Victory Gundam. Adopting the same type of generator as the Victory Gundam, the Gun-EZ has a simple structure without either combining or transforming mechanisms. It also uses a large number of standardized parts, resulting in a mobile suit with high capabilities that surpasses those of the Earth Federation Forces at that time while also being easy to produce and maintain. Though the Gun-EZ could not achieve the same altitude, speed, or distance as a flight-type mobile suit, its mobility is more than a match for the beam rotor-equipped Zanscare Empire mobile suits.
The LM111E02 Gun-EZ served as the backbone of the League Militaire forces during the Zanscare War in U.C. 0153, and its development was said to have been carried out in underground factories near the lunar city of St.