Many of them are replaced with new Glocks that use their same holsters and supporting gear.
The barrel may take it, but many non-9mm frames won't last 100k+.
Some agencies want to change calibers, quite a few are changing from .40 back to 9mm.
Some just want new guns.
There are more Glocks by volume issued nationwide, so you'll find more of them traded in.
You're over-thinking things.



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