So if a court finds that the lower isn't the firearm, but the upper is, how would that even work out?
Would we have to go back and get serial numbers for our uppers then? How about registered SBRs and machine guns?
My guess is that Congress would need to amend the law making the lower the registered part just for continuity, but given the current House I can't see them doing anything rational. They would probably try to pass a bill making the upper the 'firearm'. leaving all of us with (illegal) unserialized rifles, which they could then legally seize.
Gotta better chance of getting struck by lightning 2x in same day