What part of the rifle is grasped with the left hand when passing weapons during STACK ARMS?

When performing the STACK ARMS maneuver, the left hand is correctly used to grasp the hand guards of the rifle. This is crucial for maintaining control of the weapon while ensuring safety when passing it between Marines. The hand guards are located near the front of the rifle, allowing the Marine to easily maneuver and manage the weapon effectively.

Using the hand guards provides a stable and secure grip, enabling the uniform handling of the rifles during the stacking procedure. This technique is essential to prevent any accidental discharges or mishandling of the weapon while in formation, emphasizing the importance of safety protocols in Marine Corps training.