I did some research on this very topic and the problem is not just Glock. Google "catastrophic handgun failure" and you will get quite an education. From what I've read, any striker fired polymer frame pistol is susceptible to this calamity. It has to do with the bottom portion of the case being unsupported. Some claim this unsupported area will blow out causing the catastrophic failure. It appears that bullet setback is a contributing factor in some cases. Others claim that you should not reload cases fired from one of these guns because the unsupported area of the case stretches more, thereby creating a weak spot in the case. Who knows, but it does seem that the design of these pistols make them at least slightly more susceptible to this type of failure.