holy shit, did you even read the post you quoted? like, at all?
1. ANYONE (well, aside from prohibited persons) can manufacture their own firearm. ffs, i even linked someone making an ak from a freakin' shovel. no ffl. no seller.
2. there are plenty that are exempt from this - and ALWAYS were. ie: never recorded. from ones that pre-dated 4473s to black powder revolvers (which can be legally converted to fire .45 rounds with a simple cylinder change)
it's comical how you claim to be a lawyer and then post outright false bullshit - regarding legality.