Well, the Fobus is designed for the Beretta 92, and the retention is based on the trigger guard. While the CZ75B and the 92FS have similar trigger guards, the CZ75 trigger guard is a different shape. So you have a gun in a holster that doesn't quite fit right, and the retention doesn't work well. At first it was too tight, once "broke in", the gun would literally fall out if turned upside down.