Which of the following is not an ammunition type used with the M16/M4?

• A. Ball
• B. Tracer
• C. Dummy
• D. Armor-Piercing

Answer: (D)

When thinking about ammunition for the M16/M4, you’re dealing with rounds that are routinely used for training and combat versus specialized rounds with tighter restrictions. Ball rounds are the standard combat/training ammunition, designed for reliable performance with a solid penetration profile. Tracer rounds add a visible path to aid shooters in tracking trajectory and impact, which is useful for training and fire discipline. Dummy rounds are inert dummies used for dry-fire practice, function checks, and load demonstrations without firing any projectile.

Armor-Piercing rounds exist for the 5.56mm family, but they are restricted for safety and policy reasons and are not part of standard issue training or routine field use. Because of the safety concerns and regulations surrounding their ability to penetrate armor, they are not normally employed in everyday M16/M4 training or standard operations. That’s why armor-piercing is considered not an ammunition type used with the M16/M4 in typical practice.