Not at all. There are a few visual similarities, but that's about it. The CZ (as originally made) is a DA/SA, with the entire trigger mechanism contained within the frame. The High Power is a SAO and uses a "toggle" (not sure of the correct term) located on the underside of the slide to connect the trigger with the sear (and so cannot be dry-fired with the slide removed). High Powers also come standard with a magazine disconnect, which CZs lack. And finally, as you said, the CZ's rails are internal to the frame, while the High Power's are external.The Annoyed Man wrote:I don't know much about CZs, although I am aware of the way the slide rails are different. But other than that, isn't the CZ basically a Browning Highpower?
While the CZ 75 is a fair conceptual descendant of the High Power, there's not much they have in common mechanically, aside from the modified Browning-style delayed-blowback action.