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The .40 S&W Glock KB's were, to my understanding, an issue of ammunition as much as anything. Certain .40 S&W ammo (180grn Federal Hydra-Shoks in particular) is somewhat prone to excessive bullet setback if the same cartridge is chambered too many times. The .40 S&W cartridge is rather sensitive to changes in internal case capacity and bullet setback can cause great increases in pressure. This, combined with Glock's unsupported chamber, created the perfect storm and KB. If you are careful about your selection of ammunition and how many times you chamber a given round, I doubt you'll have issues. The Glock 22 and its brother the G23 are both very popular among law enforcement, I doubt this would be so if there were a pandemic of KB's.
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