Or track Glock Generation changes.I think a good side by side would be comparing longevity between the Glock 22 ...
The .40 S&W was introduced in the Gen 2 guns.
The Gen 3 guns added an additional cross pin for more rigidity. Probably specifically for the .40 S&W guns.
The Gen 4 guns got a dual recoil spring to help with the .40 S&W guns. This caused problems with the early Gen 4 9mm guns.
The Gen 5 .40 S&W guns now have a thicker slide.
Glock is probably on Gen 5 only because of the problems they've had with the .40 S&W guns.