Do suppressors need to be cleaned?
All suppressors will collect debris; some suppressors are cleanable, some are not.
The amount of debris depends on usage. The pictures below are of a Defender 556 core used for about six months by a SWAT officer on a 7.5” AR.
Carbon, lead, and copper collects on surfaces and in crevices. A significant danger in not cleaning a suppressor is the risk of a dislodged chunk of this stuff disturbing a bullet and causing a baffle strike.
Here’s my answer to how often you should clean your suppressor:
Clean it when you clean your weapon…if you can.