The design looks like something from 'Halo: Combat Evolved'. Was that intentional?
And the gun magazine should be moved. Even assuming it uses caseless ammo, i.e., it will NOT better the shooter's face with spent brass, the magazine is practically begging to be banged against a hard surface, damaged, and jammed.
Wonderful model with amazing details! Very impressive, especially the joints. Clean and Beautiful! Have you thought about modeling the new Iron Man Armor (mark 8/42) from the upcoming Iron Man 3 Movie?