I used bits of foam inside my P90 to help quiet it down a bit... Its just simple foam similar to what is most gun cases that i have cut more or less to the exact dimentions of the back compartment - since i use a large battery, its open space. It doesnt do THAT much of a difference, but you can notice the difference in mechbox noise making it less sharp.
Best solution, outside of upgrading some components to make the mechbox quieter, is to get a suppressor of some sort with foam inside (doesnt really matter what length), as it removes most of your sound signature - can barely hear it at a distance.
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