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No. 106359
ID: 508f1f
File
151167328011.jpg
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The only other place this is seen is right at the inlet of the gas block on the inside of the upper receiver. This gives me hope that this is burnt-up oil or powder or some other residue. However, I worry that by changing out the charging handle, or swapping out the upper rail, I may have broken the anodizing seal that prevents the steel bolts from making electrical contact with the aluminum receiver. If there was any salt water or humidity, this would have created a galvanic cell, allowing the aluminum to corrode. I understand that this is usually a very rare occurrence.
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