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Shane, without seeing your slide, this will depend on the degree of discoloration of the area compared to the rest of the slide. You can try cleaning and very lightly lubing the area to see if it is just cosmetic. In any event, the finish should not be vastly different to the general slide finish.

try cleaning and oiling if you still have the issue contact Glock Phone: 770-432-1202

Shane, Clean it, shoot it, and forget about it. Keep it lubed lightly. The DLC coatings on the Gen 4s are pretty inconsistent.