You don't give them enough credit. They are far from finished with their work. You may yet need all those parts.The serialization requirement for uppers in HB2005 was evidently tossed out, so the point is moot now.
It looks like I got Y2K'd again. I bought a gazillion firearms and lots of parts (including upper receivers) and just short of nothing has been passed or went into effect. These anti-gunners sure know how to sell firearm stuff.