From slide 17, "Case extraction and ejection successfully occur as long as the case is held against the bolt face by the residual chamber pressure while the extractor lifts and returns to position."
It is the same residual chamber pressure that I concluded accelerates the bolt and bolt carrier rearward which I observed in the high speed video I watched. I see their conclusions and mine as complimentary not contradictory.
Not that I claim any great insight on the matter. It is as simple as watching the high speed video and observing the acceleration. The cylinder / piston mechanism of the bolt and bolt carrier cannot cause acceleration at this point as they are fully extended and can not have relative motion.



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