December 27, 2020
The photo in the previous post on this topic was a complete garbage, so I re-took it with a real camera.
I neglected to add cues, but here's what we're looking at. When the steel slide slams the aluminum alloy frame, it starts to deform it. You can see the thin bright semi-circle where the metal is pressed in. The excess aluminum then mushrooms into the recoil spring channel. In this particular example, the material is (very crudely) removed where it protruded and obstructed the removal of the guide rod.
Interestingly enough, the black finish remains in the area where the slide hits it. There's no sideways friction, so it's not worn out. That is why the sliver of bright aluminum is so thin.
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