[JRandomFreeper]

Then why does federal law require that firearms be serial numbered? Forget obliterated serial numbers. A firearm that is manufactured without one is just as unlawful.

And what part of the Constitution gives the feds that power?

/johnny

[Still Thinking]

Then why does federal law require that firearms be serial numbered? Forget obliterated serial numbers. A firearm that is manufactured without one is just as unlawful.

Almost true but not quite. You can make your own firearm from scratch (or at least the receiver, which otherwise would be the serialized part) and you don't have to give it a serial number. BATFE encourages you to, so you can "identify it if it's ever stolen", but it's not a legal requirement.