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O-rings in suppressors are designed to help keep parts together and sealed rather than allowing them to unscrew or otherwise loosen during use. We use an O-ring on both end caps of our suppressors. These replacement O-rings come in a pack of 2 so that you can replace the O-ring on both end caps. These O-rings are temperature and chemical resistant.
O-rings on a suppressor last for quite some time, but sometimes they do need to be replaced. O-rings that have dried out, experienced excessive wear, or become warped or malformed should be replaced. Otherwise, it’s not a bad idea to replace the O-ring whenever you clean your suppressor. That way you’re being proactive rather than waiting for something to go wrong.