Most of the ones i have seen on the F-16 ( sidwinders, amraams, AGM-88's the harm , all had either black or a foam rubber color , kinda an orange biege tint , the AIM-120'S had a dark brown color and it was conical shaped, I am a Falcon C/C by the way and i saw the 120 when it was being tested in 91 at eglin, i dont think there is one set color, the HARM had a black plug . Rigo