We've run across this question with so-called "solvent traps." Some people claim that the adapter is the only registered part, and that the oil filters are not. Those folks are wrong.
The text Brian quoted is correct and binding. Pretty much the only part of a suppressor that does not require registration is the wipe used by some older units.
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Sometimes it’s nice not to destroy the world for a change.
--Randall Munroe
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