That's absolutely nothing. It's a non issue. Like another member said, if it bothers you cosmetically then you can touch it up with some aluminum black by Birtchwood Casey. Those 7075 lowers are very tough. One time I accidentally fell (twice) directly onto my BCM (I'm 6'2 270) directly onto the rifle flush. I though I had definitely snapped the thing in half and was in utter shock and disbelief when it didn't have a scratch on it nor was anything bent. Those 7075 lowers are built for war and are very tough.
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