If the same person had a Sig or HK they would probably make that blow up as well.
Well, it depends on the cause of the blowout, and how severe it is.
Typically, whenever I see pics of Glock KBs the guns are almost always a total loss, or pretty close to it. A lot of Sig KBs just blow out the mag and
extractor. HK's can blow up pretty good as well, but usually the upper ends up being undamaged, although with a big enough KB you can crack a frame
on a USP. There are even pics of a MK23 frame being blown up... which frankly, had to be a severe overload or a double charge.
The other danger on Glocks is out of battery ignition. In a lot of Glocks, the gun will still fire in a slight OOB condition, which is a big part of what makes some of the KBs very spectacular- if the gun can fire while out of battery, even if it is only slightly out, this can cause a KB of epic proportions- I have no doubt that this is a large source of Glock KB's with factory ammo.
This is very easily avoided by keeping the gun clean and using a recoil spring that isn't trash. To test your recoil spring, do the following.
Unload the pistol. Make sure it is unloaded. REALLY make sure it is unloaded. Point in a safe direction and pull trigger. Keep holding the
trigger. Point the gun skyward, and pull the slide back all the way, and slowly release the slide about 95% of the way, then let go. If your spring is good, the slide will go -completely- into battery. If your slide does not go into battery on its own, your recoil spring is junk and needs to be replaced, or the gun is dirty. Note that a lot of reduced power springs will fail this test, so I suppose for those springs, that's normal... but any Glock factory spring will not fail this test.
Another thing for reloaders- at least according to Dean Speir @ TGZ, an alarming number of Glock KBs are somehow linked to Accurate Arms #5
powder- nobody has figured this one out yet, but I would stay away from that as a general rule, just because the number of KBs linked to that
powder has been more than just a statistical anomaly. Either there was a funny run of that powder, or there's some kind of weird pressure curve
relationship with it that hasn't fully been ferreted out. (Of course, some guy is going to come along and tell me he loaded 20,000 rounds through his
Glock with AA#5 and said he had no problem, but frankly, with all the powders on the market, it's easier for me to just choose something else. )
FWIW I still would buy a Glock, despite the fact that I don't think they are as rugged in this regard. The "event" we're guarding against here is
pretty rare, and easily avoided, by taking a few simple precautions. If one is buying a really old gun, (eg, a first or 2nd gen) it is also useful to send the pistol off to Glock to get it refurbed; often times parts are replaced/upgraded as part of this service. I've found the factory to be pretty easy to deal with in this regard.
-Mike