Glock is really big on commonality of parts.
The classic example is when they changed the 9mm frames to match the .40/.357 frames. There was no reason to do so from a durability/function standpoint, it just made things easier from a manufacturing/maintenance standpoint for all the frames to be the same.
They tried the same thing with the Recoil Spring Assemblies when they came out with the Gen4 guns but with less success. They almost immediately had to come out with caliber specific versions.
The classic example is when they changed the 9mm frames to match the .40/.357 frames. There was no reason to do so from a durability/function standpoint, it just made things easier from a manufacturing/maintenance standpoint for all the frames to be the same.
They tried the same thing with the Recoil Spring Assemblies when they came out with the Gen4 guns but with less success. They almost immediately had to come out with caliber specific versions.