Originally Posted by ap27
Apparently the UltraGrade one is licensed by Cybergun. I'm not sure of the build of that one, but King Arms is widely known to make the best full metal M4 in the starter-range, beating out ICS and Classic Army.
Are you comparing that to the CA and ICS sportline series or their main lineup?
I haven't been keeping up with all this stuff and as far as I can remember CA was pretty high end.