We love people who don't stick to the standart, to the mainstream. People who takes a gun and customize it with their own view of what a gun should be like. Here you have some examples of "Not yet another M4".
Nothing is perfect, unless you feel so. What do you need in a gun to feel it perfect in your hands?
-DYNAMIC TACTICAL Lantac Dragon Brake Costa Version
-IRON AIRSOFT knight's Armament URX4 10.5inch
-Suzutomo Gun Tailoring
-NOVEL ARMS COMBAT T1 Costa Model
-MAGPUL PTS MIAD
-MAGPUL PTS CTR
And here some more custom guns!