Hi, RJay,
According to some very reliable sources, they didn't eject the clip with unfired rounds. They shot off the remaining rounds in the direction of the enemy so they could reload with a full clip. The ammunition wastage got so severe that orders were issued against the practice. And you can guess how much good that did.
I never heard the plastic clip story, and doubt it. No one in any authority or who had been in combat ever believed the "ping" nonsense.
Jim
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