that is what is in the 'basic' pistol Pac, 4 barrels, then there are "vented" ,or heavy (full underlugs) , and finally "heavy vented", also there were optional longer barrels, and shrouds, 10",12" and either 14 or 16" not really sure, never saw or handled one of the real long ones........
then of course other calibers, and materials ( stainless steel)
I think CZ America owns them now , and are located in New York ??