All without barrel bushings?
The 97 has a CGW bushing as does the 75B 9mm slide. The P-09 and P-07 have the factory barrel and slide fit-ups, no bushings, no fit modifications. My opinion is that the latest pistols with modern CNC manufacturing techniques are just built to tighter tolerances than the earlier pistols. Maybe that is why we never see reports of loose or sloppy barrel/slides in P-09/P-07 pistols.
Joe