When the M16 rifle was first introduced to U.S. troops in Vietnam (1965-1966), what critical product issue caused widespread failures and contributed to soldier deaths?

The Vietnam War era saw one of the most significant product launches in military history. The M16 rifle represented a dramatic shift from traditional wood-and-steel firearms to a modern polymer and aluminum design. While now iconic, its introduction was fraught with controversy and technical problems that directly impacted soldiers in combat. Test your knowledge about this pivotal product launch that changed military equipment forever.

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The military initially issued the wrong ammunition, using powder that caused excessive fouling and jamming
The plastic handguards melted in the tropical heat, making the rifles impossible to hold during sustained fire
The aluminum receivers cracked under normal use, rendering thousands of rifles unusable within weeks
The sights were incorrectly calibrated at the factory, causing troops to consistently miss targets