During the Vietnam War, which critical issue with the M16 rifle led to a major product recall and emergency modifications after soldiers reported numerous malfunctions and casualties?

In the history of military equipment, some product recalls have dramatically affected battlefield performance and even cost lives. One of the most infamous examples occurred during the Vietnam War, when a particular piece of standard equipment experienced catastrophic failures under combat conditions. This poll tests your knowledge of this significant product failure that led to Congressional investigations and fundamental changes in military procurement practices.

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Incorrect ammunition powder causing excessive fouling and jamming
Defective plastic furniture cracking in jungle conditions
Faulty sighting systems causing severe accuracy problems
Substandard steel in barrels leading to catastrophic failures