When should the headspace on the M2HB .50 cal be checked?

Checking the headspace on the M2HB .50 caliber machine gun is critical to ensure safe operation and to prevent potential malfunction or damage. This procedure is performed before firing the weapon. It is essential to verify that the headspace is set correctly to accommodate the dimensions of the ammunition being used.

If the headspace is too loose, it can lead to dangerous conditions such as a runaway gun or excessive chamber erosion. Conversely, if the headspace is too tight, it can cause case head separation or other dangerous failures during operation.

Therefore, making this check before firing is a preventative measure that helps maintain the safety and functionality of the weapon, ensuring it operates as intended. This step is part of the standard operational checks that personnel must complete to uphold safety standards in weapon handling.