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Please share pics. Did it happen on the barrel hood or smiley? I’ve seen this on new Glocks but thought (hoped) they’d solved the problem. I sweat like a pig on my 2001 G26 and she shows no trace of corrosion. Not so with my PUU Gen3 19, it became badly rusted on the smiley and a few other places.Problem is my G17Gen5 barrel rusted from carrying (I'm guessing the barrel is pushed close to the body and results in excess moisture and salt).