I didn't think this happened much in Glock .45ACP's. I've mostly heard about the .40's. Though I have read of another instance of a Glock .45ACP blowing up.
I believe Glock redesigned the .40S&W models for more chamber support recently, perhaps in the past couple of years.
The .45ACP being a much lower pressure load than the 9mm or .40S&W, again this is suprising. It would seem like a double charge or squib load, something of that nature. But of course it could easily be the gun as well.
The .40's seem to have the problem more because of a weak case design of the round, combined with it being a plastic gun with poor chamber support and no steel inserts as mentioned above. I haven't heard as much about 9mm Glock Kabooms over the years. I would attribute that to the 9mm's stronger case compared to the .40. For the first ten years or so of Glocks, you never heard much about kabooms, and most of the Glocks were 9mm's. When the .40's came out, that's when you heard more about them. But then the internet wasn't around so much during the first ten years of the Glock so I don't know what to think.
Perhaps some other factors are, a lot of .40 owners aren't really "gun" people as much as 9mm and .45ACP shooters. Though certainly many .40 owners are, but probably less .40 owners are than a lot of other calibers. Just in my personal experience as well, a lot of people who buy their first handgun, or are not really technically inclined about handguns buy the .40. And there's a lot of prevailence of them in law enforcement and I know certainly a lot of those guys are not gun people.
As far as I know, early on people were cautioned away from reloading .40, but now a lot of people do, just because the round is now so prevailent I suppose.
