If the GO end of the headspace gauge enters freely all the way to the ring and the NO GO end does not enter, how is the headspace described for the M2 machine gun?

The headspace for the M2 machine gun is described as correct when the GO end of the headspace gauge can enter freely all the way to the ring, while the NO GO end does not enter the chamber. This scenario indicates that the chamber is within the proper range for headspace measurements.

The GO gauge measuring that it can fit fully means the gun can chamber a round successfully, ensuring reliable feeding and firing. On the other hand, the NO GO gauge not entering signifies that the chamber does not have excessive space that could lead to the round being too far forward, which could compromise safety and functionality. Therefore, this combination indicates that the headspace is neither excessive nor inadequate.

In summary, this description signifies that the weapon will function as intended, supporting proper operation and safety standards necessary in combat arms training and maintenance contexts.