KBs in Glocks are due to:
1. Glocks can fire out of battery. That is a out-of-speck round that is to long will still chamber and fire. I've had two kabooms in Glocks (17 and 26) due to this. Not a real fault of the gun cause alot of others can still fire when they are just a bit out of battery.
2. Unsupported chambers. This relates to #1 above. With a slight out-of-battery condition and severely unsupported chamber you can have the case fail.
3. Lead buildup in Glock polygon barrels (with the increase in pressure.) Any polygon barrel can have this happen.
4. Bullet setback. Mainly occurs if the slugs are so long there is no space in the case and if the bullet is setback the pressures rise (as they do in #3 above.) I find the lighter 165/155s are best to avoid this in the .40 S&W.
5. Weak case construction. This happened in both the .40 S&W and .357 Sig at first. Thin cases & high pressures lead to case failure. Add bullet setback, out-of-speck cases, and lead buildup and my my, I wonder how ANY pistol could not blow up!
Oh, and I've handled several revolvers that have been blow to bits due to bad loads. Top straps, charmers, and such were just blown off. Also seen .38 Super 1911s have case failure (known as 'superface') due to overloading for IPSC Major.
Overall, if you use quality JACKETED ammo in a Glock you will be fine. My carry Glocks are all subcompacts. 26,.27, and 33 (and right now the 27 is in play due to winter coming.)
I do not worry about KBs in it or any of my Glocks. But then I avoid gun show reloads and other such stuff. I reload using only Winchester, Remington, Federal, and S&B cases and throw away the rest.
Deaf