I've been told that 1 in 2 of the CZ 458s will work without a problem - interesting the criticality of the timing of release from the magazine appears to be at the tolerance of the manufacturing of the firearm, which makes me hope that there may be a easier fix than to rechamber (probably easy to mess up too if I'm not careful). Probably can't compare a working CZ against a jamming CZ to pick the difference to be able to fix easily.