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The marks are normal, the case neck is making contact with the barrel extension locking lugs.
Your other issue requires more information.
I just had an ejection issue with two Aero precision uppers. My personal rifle was only ejecting the brass half way and smashing in to the front of the ejection port. Long story short I put a new JP bolt in the BCG and runs great now.Sorry I meant to include that in my previous post. Aero rifle buffer tube and spring.
Thanks. At the range now. Will se how it goes and report back.I just had an ejection issue with two Aero precision uppers. My personal rifle was only ejecting the brass half way and smashing in to the front of the ejection port. Long story short I put a new JP bolt in the BCG and runs great now.
Second one is my friends rifle. His was a buffer issue. The gun cycled fine but would not lock back on an empty mag. We tried a few standard buffers and springs with no luck. He put my JP captured spring buffer in and runs perfect now.