|The two rounds that failed to feed. Would it be accurate to call those "hickies below the neck" since the marks were made by the lips of the magazine?|
My friend informed me that what we tested was not "bone-stock".
The Oracle came from the factory with a 30 round, polymer magazine PMAG 30.
We tested the Oracle with a ten round, C Products Defense steel magazine.
Playing with the follower, the PMAG has better anti-tilt and the lips of the magazine are not as sharp as the C Products. My expectation is that the PMAG will feed better at lower bolt return-to-battery speeds.
While that information invalidates the data it confirms the hypothesis that changing your AR can reduce its reliability.
The sweep will be repeated in the near future with the factory supplied magazines.