Thought about that instance of feed jamming issue again. The myth was how the round jumped out of the magazine well's mouth and blocked horizontally at such a high position. Somehow, the magazine well's mouth did not hold that round, the cartridge simply jumped out. Not likely being a spring strength issue.
Looking back, I did not clean up the grease inside the magazine well thoroughly before shooting. One possibility was the residue grease melt under higher temperature after certain number of rounds being fired and that cartridge case became very slippery.
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