Yes CZ did use a different method for the US barrels but that process is no different than many other US made barrels on other brands and they are accurate and reliable. No one as yet has proven on method better than the other. one very distinct advantage is the US made barrels are supposed to be saami spec vs the cip overseas spec which should translate the the US barrels not being as short throated as the Czech barrels. This has been a bane for CZ owners since they first showed up here.
Ah interesting, I'm very new to modern firearms. My background is collectible pistosl from WW2 and earlier. So there's a lot for me to learn but my understanding is it takes A LOT MORE upfront money/investment to create cold hammer forged barrels than simple button rifling or whatever they call it when they make none cold hammer forged barrels. (It takes a lot more tooling to make cold hammer forged barrels so it's more expensive upfront but then they can crank them out).
My thought process is that American companies are unwilling to invest in the tooling and cost. And it's disappointing to me that CZ is willing to let Kansas City made pistols be made differently. I think that's wrong and I don't like it. So that's why I'm probably too obsessed with making sure my CZ pistols remain Czech Republic parts.
Another thing I wonder is if hardness test stamps are seen on the inside of as many Kansas City made CZ's compared to Czech Republic made CZ's. I strongly believe there is more of a traditional craftsmanship that occurs in Czech Republic similar to what you see in Germany and Swiss shops. High School aged students start working in factories and learn old school traditions of craftsmanship and it shows in their products. I have industrial jewelry tools from Czech and they of very high quality.