This is an original Federation Mobile Suit I designed for a Mekton role-playing campaign I played in. It's the Earth Federation Space Forces' standard Mobile Suit in U.C.0401 -- a highly advanced derivative of the GM with Minovski Drives, Psychoframe, I-Field Barrier, the works. It's name, "GzS," is pronounced "Jesus" and it stands for Gundam-type Zeta-derived Superior (or something like that).
This image shows the Ace pilot variant, which sports a Hi-Mega Cannon on its forehead.
Gundam is copyright Sunrise/Bandai/Sotsu Agency, whoever else -- no infringement intended, etc.