Which controversial design change was made to the original M16 rifle during the Vietnam War that initially led to widespread malfunctions and contributed to soldier deaths?

The development of military equipment represents one of history's most significant product evolution stories. From rudimentary weapons to sophisticated systems, product development in military history reflects changing warfare needs, technological advancement, and strategic priorities. This trivia focuses on one of the most iconic military products in modern history and its product development journey.

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Switching from chrome-lined barrels to non-chrome-lined barrels
Changing from wooden stocks to plastic furniture
Moving from a direct impingement system to a gas piston system
Reducing the magazine capacity from 30 to 20 rounds