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Sorry, I can't help you. I don't have one on hand to measure.

What brand of pistol and what brand of sight?

Yes, it's difficult to accept the test results without knowing more. The also tested "bluing" and "black oxide" separately. Black oxide IS bluing, at least it's the most common type used (AKA hot...

I was on NIC/Cerakote's website the other day and saw their wear test results:
http://www.cerakoteguncoatings.com/resources/files/testing/Abrasion.pdf

The Ionbond coating was the worst performer...

I'm holding that abomination in my hands as we speak. Bill put it though some salt spray corrosion testing before he sent it to me to look at. There is only one area of rust on the entire frame...

Nice review Bill!