CZ makes its barrels in the Czech Republic. All meet CIP specs. CZ makes barrels with muzzle threading for European markets and for North American markets. Chambers remain the same regardless of muzzle threading.
SAAMI specs don't concern CZ just as they don't concern other European manufacturers who make rifles with "match" chambers such as Anschutz. There's no regulation that requires North American .22LR barrels/chambers to have SAAMI specs. When they do, it's because the manufacturer chooses to follow SAAMI as a standard.
The thread, like the use of the term "match chamber" are for the American Market. I wish I could find it, but there was a statement from CZ some years ago where they stated that all CZ barrels had match chambers; this was in response to a question as to why American barrel makers had "match chambers" and CZ did not. CZ USA changed how they label and market to appeal mor to the US market. Honestly, I have seen nothing to make me believe otherwise.Found it!!!
From CZ: https://www.czforthosewhoknow.com/blog/2021/10/12/accuracy-comparisons-between-models/
Accuracy Comparisons Between Models
Questions regarding accuracy comparisons between different CZ rifles are often asked. The answer is simple, all CZ rifles have the same quality premium hammer forged CZ barrel. CZ rifles have always been prized for accuracy. This is especially true in the world of rimfire competition. While the disciplines rise and fall in popularity, and the stock and barrel configurations change to meet the demands of each game, the heart of the rifle hasn’t changed. The CZ rifle barrel remains at the top of the class in the world of production rifles.
All CZ bolt action rifle barrels are lapped at the factory for accuracy, eliminating the need for a “break in” period. This being said there are several factors influencing the accuracy realized from each individual rifle.
While the barrels of both the CZ varmint and sporter weight models are of the same high quality, the varmint being the heavier and stiffer of the two is more forgiving over a wider range of loads than the thinner barreled sporter weight models. For example, given a selection of 10 different .22LR loads from various manufacturers, the varmint weight barrel will shoot to the best accuracy potential with 4 of the loads and it shoots another 3 of the loads very well. In general, the sporter weight barrel will be more sensitive to differences between the loads. Typically out of the same 10 different loads tested with the varmint weight barrel, it will only shoot at its best with 2 of the loads, while another 3 or 4 will shoot acceptably. Typically there will be a few loads each individual rifle really likes and a few the rifle really doesn’t like, with the rest falling somewhere in the middle. By starting with a quality action and premium barrel, the odds are stacked in your favor, making the search for the best accuracy combination easier.
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