It is to assist in detaching the suppressor when it's hot. It's also to help prevent inadvertent burn injuries. The suppressor covers I ordered are cheap enough to just get them and see how it goes. I ordered two tubes that you cut down to size for $50 plus the $14 shipping cost. I wasn't too keen on spending $90 and up for what various places said is the cost of entry for a quality suppressor cover.
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