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Glock KB's are not a myth, but the reason is still in dispute. The best evidence is that insufficient case support is at least one cause. Another possibility, that I don't think has been tested, is of a shooter of a .40 pistol accidentally loading a 9mm into the magazine and having it enter the barrel then go forward and not fire. The shooter, thinking the gun failed to feed, puts a .40 behind the 9mm and fires.
FWIW, a bulged or burst barrel is not caused by air compression or the rear bullet expanding. The rear bullet is moving and when it stops all its kinetic energy is instantly transformed into heat, which softens the barrel steel and allows the pressure to burst it.
Jim
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