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Whats up with the unique HK slide stop patina? I'm not sure what type of finish they apply to their slide locks but the ones I have seen on well worn HKs (including the P30 I just acquired) wear into a very unusual look.
 

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I think it's because the metal used is different than the slide itself. Could be the same finish, but it takes differently to different metal/texture. The extractor/loaded chamber indicator also patinas differently. If you notice some pics, it often turns purplish over time. Totally normal. Even brand new, these parts appear a little different.
 

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The heat treatment of the metal will cause the anodizing to not adhere/stay in color. Hence the purple color. P7s had this issue as with certain batches of Bushmaster receivers.
 

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Honestly, the lever in that picture looks rusty. Maybe it's just the lighting?

I know the extractors turn purplish, but I've never noticed a color change on slide stop levers. Well, I shouldn't say no change, mine have gotten shiny on the corners/edges.
 

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Is this the patina of which you speak?





As stated earlier, the hardening process of the metal prevents the HE finish from adhering to the metal. The metal is still protected, so it is purely cosmetic.
This is what I meant. My german made HKs have this issue, the US made one is still black.
 
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