I think a HUGE number of the Glock kabooms were not "internet hype" but rather Glocks choice to pursue reliability by taking chances with loose chamber dimensions. Too little chamber support combined with the high pressures of the 40 or leading in the barrel combined to create separated case heads with only a plastic frame to contain the resulting release of pressure. New Glocks have much better support in the chambers and I wouldn't feel the least concerned about any of them especially the 45 which operates are lower pressures anyhow. Glock has quietly made many changes and improvements to the newer generations of guns. They just don't tell anyone because they refuse to admit their weapon is anything but "perfection". The Glock 21 is a pretty fine weapon. I wouldn't mind getting one myself one day.
Why has INTEGRITY become such a rare commodity?