Give me time to find, post, and label the pics... here is a quick answer.
The Gen 5s have 3 changes that I'm aware of over the 4s... Bearing surface reduction of the lower carrier bearings, dirt grooves around the changing handle notch no longer machined, and chrome lining after the weep hole is drilled. The surface finish was also changed from a rough textured park to a smooth park but it's not a mechanical change so I'm not really counting it.



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