ICS guns are louder in general due to the split gearbox. So in comparison to other m4s it'll be slightly louder. To get mine quieter, i put in 2 sorbo pads with a custom airbrake and a TM EG30000 motor so the only noise i hear now are the gears. Other than that, it's pretty quit now while maintaining a 400fps
Not only are ICS guns louder in general, but m4's are also louder and hard to work with unlike p90s or Augs as there's no room for any kind of foam or anything like that.
If i installed proper helical gears with a perfect shim job, i'll probably end up with the quietest ics ever...lol
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