I thought the scoring was from the square notch in the back edge of the feed ramps. I could be wrong.

I'll do a test once i get off shift and will advise the outcome.

I'll put a dot with a Sharpie onto the top of the case while it is loaded into the magazine. I'll then slowly feed it into the chamber and slowly eject it (noting the position of the dot during the process). I'll report back.

The scoring certainly could be from the ejector and extractor dragging the case against the ejection port side of the barrel extension. I'll report back.

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