Parts in suppressors are consumables. The serial number is on the washer so I assume that's the part that can't be replaced.

With the oil filter suppressors only the adapter is the registered part. You can replace the filters as they wear out (which of course is gonna be quick)

This isnt a particularly unreasonable example, I really can't understand why people are mocking it. It doesn't matter what the silencer is made from or if it works (at least half of the suppressors I have used have been totally useless), just that the person registering it claims it meets the requirements. Why would they lie?

This is basically a guy saying "hey I told the government service set up to record blue objects that something was blue and they believed me, tee-hee" when it the something in question was a potato, painted blue. It's just dumb.