iH8DemLibz
When All Else Fails.
Why not get giddy if you've paid the stamp fee? It's completely legal to build one at that point, no?
If you tell them it's for a suppressor, and you write Suppressor Tube and Caps on your drawing, do they have a Suppressor/Class III manufacturing license?
Best to call your drawing: Muffler Bearing Removal Tool.
Even then it may not be totally legal. Same as getting someone else to finish/machine an 80% lower. Not allowed by law. The end user has to be the manufacturer.
IANASML