As 10mm states, the slide runs inside the frame. Here's an excerpt from an article on the CZ 75 posted below, that describes the slide and frame relationship:CZ seems to have an interesting slide to frame setup - maybe the OP article mentioned it m. It’s distinct in all the pics on this thread...
"The CZ-75 has internal slide rails, just the reverse of the majority of semiautomatics on the market today. In other words, the slide is contained within the frame rather than riding outside it. Frame to slide to is not nearly so tight as on the Hi Power, 1911, or practically any quality automatic you can name, but the CZ-75B pistols do seem tighter in the examples I've seen than the Pre-B pistols."
Excerpt from article "A Critical Look at the CZ-75":
A Critical Look at the CZ
hipowersandhandguns.com