O.K. I looked, the title does imply bias.
Right in the site it says test results to determine what's causing this problem are inconclusive.
Why do kB!s occur in these Glock models?
Reports compiled by Speir from various independent laboratories are inconclusive as to one single cause for the catastrophic failures.
Then it goes on to say
There do, however, appear to be several contributing factors which collectively may induce catastrophic case failures:
I added the italics to appears. He says "appear" and doesn't say "does cause"
Here are the factors they point to.
Firing out of battery. Most Glocks will do this to some degree, especially those improperly maintained.
Significantly overpressure rounds. These occur mostly in homemade reloads or in commercially remanufactured ammunition, but have occurred in factory ammunition as well.
Lack of full case support in the critical area over the feed ramp of all large caliber (.40 S&W, 10mm, .45 ACP) Glock pistols.
Ostensibly as a measure to promote feed reliability, Glock chamber mouths are slightly oversized. One can test this by removing the barrel from the Glock, dropping a factory round into the chamber, and observing that there is brass exposed at the six o'clock position. Take a fired case and note that there is a slight engraving if not actual bulge around the case web, which is most pronounced in the area of the case which, upon firing, was in the six-o'clock position
Use of personally reloaded or commercially remanufactured ammunition utilizing cartridge cases of indeterminable generation. Unlike most rifle hand loaders, those who reload for handguns do not as a habit segment their fired cases by generation, and each time a case is re-sized for reloading, the brass "works" and weakens through enbrittlement.
Several kB!s have been documented with factory ammunition, but most of them occur with either commercial or homemade reloads.
They then post this FAQ
Do kB!s occur in other guns or just in Glocks?
kB!s do, of course, occur in other guns, but no one appears to be keeping accurate statistics for most of them. Many 1911-style handguns have partially unsupported case mouths, and numerous case separations have occurred in these guns. Early .38 Super barrels were particularly susceptible, and the critical observer may have noticed the predilection among USPSA .38 Super competitors for full beards in an attempt to cloak the vestiges of what came to be known as "super face."
Respected firearms author Frank James, in 1994, documented a number of kB!s in HK USP .40 pistols, which do have fully supported chambers.
This is not some new phenomenon. We went through this back in the late 60's with Super-Vel in auto's (wow, I'm old, I remember that, oh that's another topic.)
One of the things they don't mention is the problem that was credited with causing the Super-Vel problem, the bullet bullet getting pushed back in the case during loading. Push that bullet back in the case on a high performance load and pressures are going to rise.
The mention not shooting certain Federal 40 S&W ammo. That was pretty well documented as a problem of the round getting pushed back in the case. But they don't report that.
They also mention that Glock does say don't shot Reloads.
The Glock sucks aside reference aside that is a very interesting website, until the end. The whole website and the information presented comes a across as credible, that is until you read the last paragraph.
That last paragraph makes the whole website look like a website of some one with an ax to grind. It's a shame
I would add here that you can sell your plastic fantastic to some unsuspecting moron or some CQB Killer wannabe or a flat footed local Barney Cop and by a real gun, like a SIG-Sauer, Walther or H&K.
