Is your brass trying to tell you something?

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Sanford

Sharpshooter
Special Hen
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40 Miles S. of Nowhere, OK.
Okay - what do a series of about 1/4" to 3/8" long vertical brass marks on the side of the receiver about 3/4" to 1-1/4" behind the ejection port on an AR-style .308 mean - no visible damage to the brass. Any clues?

P1000330.jpg

You can just see a little of them left in the center of the picture - they were much more visible before I cleaned it after shooting. Could probably have rubbed them the rest of the way off but I didn't want to rub down to bare aluminum and decided they'd eventually come off (or end up with more friends) anyway.
 
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