Wow those are all nice so far, all I have is a stock CA36k with the long RIS rails and vert front grip:
http://68.147.205.84/pics/DSCN2353.JPG
btw, I'm thinking of getting a G36C top rail so I can add a better scope for outdoor (thats the only place I can use it, since in Calgary your gun has to shoot under 320 FPS for indoor games)...