Correct... You have to build the ecosystem and contracts outside of the blockchain. Then you put it on the blockchain in order to make the data resilient to failures or interference.

Game publishers could push the headache to license/account management to the users, but I also suspect it wouldn't be very popular in practice.

Saddam was in a ruling party backed by a minority. Most Iraqi's didn't have much love for him.

Vs. Afgahnistan where the insurgency ultimately won...

Pure military equipment doesn't mean much if you don't have the free cooperation of the populace, and there are already States that have openly declared that they not only wouldn't cooperate with confiscation, but that they would use their police and courts to oppose any agents who tried.

Sex offender registry is only the result of a judicial process, where there is an adversarial proceeding where the defendent is allowed to challenge evidence and bing his own.

Bending psychiatric institutions to political purposes as a long and sordid history. No true professional aimed at actually helping people would participate in that farce.

For the constitution issue, If I have a right to own a gun, and you have a right to own a gun, and we both have to right to trade for any legal purpose how the hell is a private sale not also an implied right? It's been ruled on multple times.

Machining a modern barrel is hard, but if you aren't too picky about durability and high accuracy the process of using a button die through softer material is pretty approachable. The challenge isn't in machining the barrel, but in machining a straight enough barrel compared to what's available off the shelf.

Also EDM processes are entering the hobby space, which would let you do barrels in hardened steels with so patience.

And while congress could decide to regulate more parts, the cost of that additional regulation vs the scope of the problem it's trying to solve isn't all that great. You're better off spending the money enforcing existing gun laws.

Like nobody has ever made their own primer compund? Firearms are relatively simple devices. You can make them less available/more expensive by cutting the industrial supply line, but it's not going to stop someone that's highly motivated.

Also give that primers are both the smallest part of ammunition and the hardest to make, they are a ripe for smuggling operation.

Bring in foreign troop to enforce gun laws... I think there was a Massachusetts governor that tried that once.

Ya you going to throw 30% of the population in jail?

Once the first hundred or so enforcers get shot, they'll rethink their strategy. Unless you're willing to go full martial law you'll find confiscation impractical.

Civil war isn't needed, just civil disobedience, and that's why ghost guns scare the shit out of you.

What, you going to serialize blocks of walnut? hallow steel tubes? Raw aluminum billets?

Congress (but not the ATF) could redefine firearm to cover more parts and require serial numbers on them. However this isn't going to be retroactive, and there are tons of logistical and practical problems with the scheme.

And universal background check is a non-starter politically because it's essentially a gun registry, and registry is always the first step towards confiscation. It also runs afoul of the 2nd, 10th and 14th amendments.

A system that might actually fly is if there's an endorsement you can get on drivers license/ID specify for firearms which is automatically applied. The state keeps a revocation list but it's otherwise presumed that private sales, or sales of ammo/components to such persons are OK. Yes it's not a perfect system but you are never going to achieve that anyways. You are just trying to impede bad actors and make it easy to good actors to make informed decisions.

Spurious correlation...

All firearms that existed 232 years ago would be considered ghost guns today.

Clinton just banned scary looking guns. For every feature banned the was an legally available alternative that was functionally equivalent.

And the types of weapons banned were responsible for a minuscule proportion of crimes committed. The idea the clinton era ban did anything to crime rates is laughable.

Crime rates dropped everywhere, and is likely attributable to good economic conditions, shifting demographics, and to lower rates of lead exposure.

Do you even realize how much damage one could do with a couple of bike locks and two gallons of diesel fuel? It's not the inanimate objects that are the problem here.

Instead of abolishing guns, we don't we abolish compulsory public education which was explicitly designed to crush non-conformity and creativity or the plebeians.

Currency has specific design patterns that were specifically created to be easily picked out via computer algorithms, and it has to be that way to avoid false positives. Governments have 100% control over the design or currency so it was an easy solution. But counterfeits still exist, you aren't going to be able to prevent someone from using lenses, etching chemicals, and plates to copy currency. And it only works because micro-jet printers are black magic that you aren't going to replicate at home. Whereas a +/- 0.002" milling machines are a comparatively easy construction, especially when you can make them with parts in stock from McMaster-Carr.

Firearm receivers are about functionality not easily reducible to a specific test or single thing to look for. AI won't work, as there is just too much variate and chance of false positives. In addition and adversarial AI can easily generate a design the tricks the first one by slightly changing non-functional parts of the design. Also even if perfect, you could print a 70% receiver and the jigs needed to finish it with hand tools.

Best method is to blacklist the hash signature of known firearm containing files. It's not going to stop someone that's determined and knowledgeable (and you never will) but will be enough of a hurdle to prevent every tom, dick, and harry from doing something in a hurry they might regret.

Simply grinding off the SN shouldn't doesn't make the SN completely unreadable, you can usually still process/etch the receiver and recover the SN. However the agency may not think it's worth the effort. Also could just be an old/antique firearm that were "siezed" from gramps when he got dementia and was moved into a care facility.

Firearms are relatively simple mechanisms, and manufacturing tools are more versatile and capable then ever. Ghost guns aren't preventable via regulation. Really the only reason there aren't more is the legal firearms are for the most part easier, cheaper, and higher quality.