Here are some screenshots of what GMs typically look like.
Note how their name is masked to
-- Administrator -- --The above images were of dschang, also known as GM_Slider on the forums.
Also, when they talk, they have orange text.
It will look something like,
Administrator: blah blah Terranwolf is a noobThe current GMs for GUNZ are:
GM_SKiNG
GM_killua
GM_devilito