As a gunsmith I can say that there are multiple problems with this.
The first problem is that chambers need to be smooth for feeding and especially extraction. Once the case is pressure formed/imprinted on the “carbide code dots” will it extract reliably and will the extraction process obliterate the code by dragging? This would not be an issue in shouldered cartridges as the code could be on the shoulder and therefore free from drag-by, but on straight-walled cartridges how would this work?
Second problem is that ANY semi-intelligent knuckledragger with the proper reamer and file could defeat this expensive requirement in about 5 minutes.
This is just another bad idea to deny gun-owners the Constitutionally confirmed RIGHT to keep and bear arms without state interference. Shame on Colonfornia.
What I am saying is that this micro etching is incredibly small right at the end of the brass, you won't see it without a microscope. There will be no drag at all, heck, if you really wanted to you could relieve the material around the stamp and leave the stamp at the height of the chamber and it would still work without notice at all. Carbide like we work with here would never wear with brass or soft steel casings, at least not in 100k rounds minimum I would guess.
I am laughing my butt of that they think this will actually prevent crime, and you and I both know how easy it is to alter it, but as an engineering point of view this very easy to do considering the pressures already applied to the casing and the hammer/firing pin striking already taking place. It is the fact that they would need to keep track of every one of those numbers that bothers both you and I the most I think. This would automatically mean a huge database of gun registry data on guns they have no need to be following around, and lets face it a sawed off shotgun or older gun is more likely to be used in almost all crimes anyway.