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When I went to the Glock Armorer's school the Glock Instructor said that tenifer is applied to the slide by a chemical process and goes into the metal to a depth of 4 microns. They only do the slide and all it does is make the treated metal very strong, but also somewhat brittle. That's why it's so shallow. Then they parkerize over the top of it, that's what you see rubbing off sometimes.
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