I can think of a couple of ways to mark bullets and cases. The same for chambers in any given gun that'd do the job for stamping brass under pressure, eliminating the easy switch-out fix of a filed firing pin, although it doesn't preclude barrel/cylinder swaps.
Cheap.
Easy.
Infinitely adjustable for a gazillion different numbers/codes/what-have-you.
With an existing technology.
Probably even with
existing machines, no less.
It's called laser-etching. Lasers can be controlled to amazing levels of microscopic precision with modern control systems. Lasers can cut through 3/8" thick high-speed steel with a kerf less than 1/16" thick in whatever shape you might want, so they oughta be able to handle carving dinkum little symbols into ornance steel with little effort, never mind lead or gilding-metal. With a bit of easy configuring of fiber-optics, an etching-head could be arranged to reach any given part of a chamber/barrel/you-name-it, making casual mark-removal decidedly difficult.
Digital technology to cycle the code/number symbology in an eyeblink's time, and another blink to etch. I shouldn't imagine it'd be over-hard to etch even the
inside of jacket material before swaging, on a constant-run production basis.
Given the current state of microchip-manufacturing imaging technology, I don't even see it requiring a whole lot of re-engineering. Granted, chip imaging is a different proccess entirely, but it certainly proves an existing level of imaging technique that provides huge amounts of info in a tiny environment to an amazing degree of complexity and reliability.
Now, none of this does a darn thing to mitigate the logistical nightmare that tracking all this info would entail, but unlike the "ballistic fingerprint" bushwah from awhile back, this doesn't entail maintaining a database of physical samples,
just a database of digital info.
Computer and information storage and manipulation is (A) already immensely powerful, and (B) growing by leaps and bounds on a daily basis. Keeping track of what amounts to a gazillion-squared different numbers around guns/ammo/components is eminentely do-able.
Folks, Silicon Valley lives in this idiotic state. It's what we do BEST.
One saving grace is the private-party transfer exception to micro-grafitti implementation, but that can be labeled a "loophole" in a heartbeat. If the "safe list" becomes the ONLY list of transferable guns within the state, all the existing guns become like our 'assault weapons', subject to sale out-of-state only. In a generation or two, most of the existing handgun supply is history.
Nice of Kaliforny to outsource what we regard as 'problem guns' to the rest of the country, ain't it? Not "safe enough" for OUR pretentious ideals, as they're too easy for criminals to abuse, so we'll just dump 'em on you folks. Just so long as they're not in OUR backyard, it's outta sight, outta mind, and the devil take YOUR state. All our guns are SAFE.
Oh, except for all those guns that the criminals kept. We just refuse to talk about those. They smear the lenses of the rose-colored glasses, you see. And it's rude to pop people's illusionary bubbles. Musn't frighten the sheep...
We're setting up OSHA for criminals in the world's sixth largest economy, and where some of the nicest places to live that EXIST in America are located. I just don't get it...
Why are we giving it the worst part of human society with a shiny yellow bow and a big smile??
We're doomed. Where's that friggin earthquake we're due for?...
:barf: