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124 Posts
I am not aware of any special treatment done to the inside of Glock barrels. Its just the way the lands and grooves are cut. The question about the slide discoloration is more of an appearance thing rather than a defect. Just had all of mine out of the safe and each slide lightened up a little when I touched with my fingers and returned to darker black when wiped down with a towel. Have think the oils in the skin tend to react with the slide finish differently from person to person.