What is the expected outcome when squeezing the trigger and holding it to the rear while manually retracting the slide?

When squeezing the trigger and holding it to the rear while manually retracting the slide, the expected outcome is that a click will be heard and the hammer will not fall. This is because the trigger mechanism of the M9 pistol engages the hammer only when the trigger is fully pulled to the rear. By holding the trigger back and manually retracting the slide, the slide cycles without releasing the hammer; as a result, the internal mechanisms are not activated to release the hammer.

This process allows for the chambering of a round while ensuring that the gun does not accidentally discharge. It is crucial for maintaining safety and control, particularly during training scenarios or when clearing a malfunction. The sound of the click indicates that the trigger is being depressed but the mechanism is not in a position to release the hammer, ensuring the firearm remains safe until it is ready to fire.