When using a Field Gauge, what should the action do?

When using a Field Gauge, the expectation is that the action should not close and not lock. A Field Gauge is utilized to assess the headspace in a firearm. If the gauge indicates that the firearm does not meet the required specifications for headspace, it is a sign that there may be excessive wear or a potential malfunction.

In this context, the correct outcome is that the action should not be able to close and lock, indicating that the firearm is not safe to operate. If the action closes and locks when a Field Gauge is used, this suggests that the firearm may have insufficient headspace, which can lead to potentially dangerous conditions during firing. Therefore, having the action not close and not lock confirms that the gauge is detecting an issue that requires further inspection or repair before the firearm can be safely used.