Another Grendel that won't extract a spent case. with Pictures. Help!

[QuadCam]

check the ejector and ejector spring. they might be on the soft side. manually feed and extract several rounds. How far and where do they thrown from the receiver? I knew there was something wrong with mine when I manually tested it and it was making a weak little pile of bullets less that a foot away from the rifle. Also, look into the extractor and it's spring. you might have an issue there too.