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This is most likely the selector plate or the Cut off lever. About a month ago I had the same problem with my ICS M4. It turned out to be a broken cut-off lever.
I doubt it is the selector plate because all the selector plate does differently from semi to auto is move the cut off lever away from the cam on the selector gear. So, unless the small spring is detached and the selector plate is jammed in the up position the selector plate is not broken.
The most probable cause for malfunction is the cut off lever being broken at the tip where it interacts with the gear box switch assembly.
Just to confirm... Does the rifle successfully engage the safety when you put the fire selector on safe? If so your selector plate is moving properly. If not then the fire selector plate is stuck on auto and there is a problem with the fire selector or the selcetor plate.
Move Info will help me diagnose the problem further. It sounds like less than 10 dollars of part though. (Cut off lever is $6 + shipping from eHobby)
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