My thoughts in no particular order...
Abuse of those serial numbers and infringement is a completely separate legal issue.
I would not be surprised if we find out the Bidet ATF has been digitalizing millions upon millions of 4473s in storage the past three years. Think of the juicy, searchable database that (is) would create(ing)...

Don't forget the gov't has thousands of lawyers and prosecutors at its disposal to fight against such "constitutional" abuse lawsuits that might arise. And like Cunter's laptop, once the info is out there it IS out there forever.
There are those who argue that serial numbers + background checks = a form of registration.
And INVARIABLY, registration leads to confiscation. One might also argue it's a violation of the 5th Amendment, too. Of course, there is also that pesky 2nd Amendment.
I agree with this. BUT we are not yet near the point of confiscation as many LEOs have ZERO desire to participate in raiding gunowners (1) because they wish to uphold the Constitution and (2) because they wish to self-preservate...
Plus, there is rampant non-compliance by normal, honest citizens (such as in IL). An unjust law is not a law...
Great. We need more supporters of "The 3D Printed Gun Safety Act" over there, because we all know that Kids, Kriminals, and Kooks are buying printers and churning out untraceable firearms.
I'd be more concerned the tracing of the files used to program the printer. Patriots in other countries are arming themselves with 3D guns. This is just a random search I clipped.
3D printing is intriguing. My only "objection" is the durability / strength limitations (currently).
If you haven't joined the Fosscad sub-reddit you should. I haven't been there in a few months but there is a lot of "experimentors" doing their thing and posting their findings.
Manufacturers and the ATF have been playing Whack-A-Mole for decades and decades. AK flats, US parts counts, imported parts kits, definition of a flash hider vs. muzzle brake, jigs, templates, CAD files, survivalist build manuals, I could go on. The game is well rehearsed, played and repeated. Pick something, demonize it, ban it. Litigate the shit out of it and bankrupt anyone who dares to challenge it.
Yup...
Does a serial number mean anything when identifying a weapon?
See my post about digitalizing 4473s above. That list, if it exists will creating overflowing of ponds and lakes due to "boating accidents"...

As a student of Forensic Science, a gun serial number trace with the ATF is not an investigative tool but more a prosecutorial tool.
I'm positive that my bank willingly turns over my credit card records if asked.
I will venture that many gun companies will provide the gov't with any customer info they want if subpoenaed. THAT is the slippery slope that will lead to confiscation. They will start with "Joe's Gun Shop" that bought 10k 80% kits (for example) and work their way down the list...
One tid bit on 3d printing. I know 0 on how to, but talking to my chiropractor who is a gun nut like us, he built a 3d printed AR he tells me but the first shot destroyed it. So that little bit of info tells me it's not as easy as it sounds. Just like building a

gun doesn't take 30 minutes.
See my search link and check out fosscad...
In the end it always comes down to insulting us as builders.
I don't think anyone intends to insult but more merely debate. Then it seems like the bullies come out next and many here gang up on them.

Civility will go a long way for our cause even you don't agree with everything someone says...
