DF,
Do they still make those 29” versions?
Looking over the cz-usa website, it looks like their longest barrels now, are 25.8" .
At one point, there was a 455 barrel that was 28.6" long, but that is no longer available, and not available as a barrel set, either.
CZ has a habit of stomping on their personal parts and discontinuing the better models for "something else" that is cheaper and easier to make. This is just another example of that tendency.