Why would you want to reduce the air volume? My vsr managed to magically be dead silent without an air brake or the sorbo pad with a 430mm barrel.
Adding sorbo is a poor and ineffective solution. It will foul the laminar airflow to the barrel and will cause problems later on. If you REALLY need to reduce the cylinder volume its best to Install an airbrake or make a port. But i really dont see why you'd need to
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