look at the motor adjustment se screw. it might simply be too tight and the gears have a hard time running...
Otherwise. I saw an AUG filled to the top with some sound suppressing material... does part of the job, but still a noisy gun. I had one before...
Now I have a P90... almost don't hear it myself....
Try that and if it still does a lot of noise, then you might have an other problem...
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