I had a CZ (bought it from CZ USA) for the P07 DUTY. It's one of those drop leg holsters. Kydex with a spare mag pouch in front of the holster.
Once the RMR was installed on the P07 DUTY (with the taller front/rear sights) that pistol won't fit the holster anymore.
I got it out today and started fiddling with it and the new P01. The P01 has tall sights on it but it slid right in, to a point. The rail was hitting the portion of the holster right in front of the trigger guard locks. I got out the old saw (one of those new fangled jobs that oscillates the blade back and forth but doesn't spin it) and made two cuts down the bottom of the holster to right in front of the trigger guard portion. I cut across (between the saw cuts) with a razor knife.
At that point the P01 would slide on it, but not quite lock up (this holster uses two latches that grab the inside of the front of the trigger guard on the pistol). I cut out a short notch in the top/front of the holster to clear the tall rear sight and it slid right in and locked up.
Carried it that way while walking the dogs, mowing the yard and the back lot, no issues.
Oh, mag pouch - a 14 round CZ 75 compact magazine fits just fine (little loose really). The 16 round CZ 75 magazine fits okay, just a little tight. The 18 round magazines with the extension on the bottom won't fit at all.
I'm happy, for now, the old holster is once again useful and I can carry the new P01 around while doing yard work, walking the dogs, etc.