How is zeroing typically performed for the M4/M16, and what does a 25-meter zero enable?

• A. Fire a controlled group at 25 meters and adjust sights until POI matches POA.
• B. Zero at 50 meters with a single shot.
• C. Zero at 100 meters using ballistic matching.
• D. Zero at 25 meters and verify that POI matches POA; provides reliable close-range accuracy and a basis for longer-range adjustments.

Answer: (D)