wdbutcher,
You have a good eye. We sent out quite a few of this bushing design for the Canik's to monitor the results. We have had -0- issues (I'll take luck over skill any day). The CGW Canik bushings were a tight fit on the barrel OD, but it's an even tighter fit for the CGW/CZ bushing.
We took advantage of the extra barrel length that protrudes out of the slide for the CZ bushing. And yes, it does indeed protect the crown.