Marks/dents on brass

[NY700]

This's past weekend my AR standard 16" mid length upper started showing very week ejection something it has not done before.

I assumed maybe it was just in need of a good cleaning.

When I looked at my brass unnoticed marks that previously this rifle did not produce

As you can see it's making a small horizontal invention. It's very consistent. Just wondering what you guys think may be causing it and any ideas on how to diagnose it.

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[Bigjake83]

It's from your brass deflector, there's thousands a way you can fix it, I've seen a lot of people use Velcro and glued onto their brass deflector, I just get some black silicone and make a layer on top of it solve the problem.

 

[Servo93]

Changing buffer weights, the extractor or its springs can alter the ejection pattern and solve the issue.

Just be careful changing these components as they can make a reliable rifle have problems.