A systema silent head set would reduce the sound from your mechbox. There was a discussion about silencing an mechbox on Arnies airsoft a long while back. All I remember was one player covered his P90 mechbox with, if I remember correctly, thin polyethylene foam. He cut a hole around the cylinder area so air could stlil travel through. A few other people mentioned that they tried this and it silenced their mechbox quite well.
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