How many safety devices or features does the M9 service pistol have?

The M9 service pistol is equipped with three key safety devices or features that contribute to its safe operation.

Firstly, the M9 has a manual safety/decocker, which allows the user to safely lower the hammer with the safety engaged, preventing accidental discharge. This feature gives the shooter control over whether the pistol is in a safe or a ready-to-fire state.

Secondly, there is a firing pin block or safety. This device prevents the firing pin from moving forward and striking the primer unless the trigger is fully depressed. This enhances safety by ensuring the gun cannot discharge simply from being dropped or jostled.

Lastly, the M9 incorporates a double/single action mechanism. In double action mode, the long trigger pull ensures that the shooter is less likely to fire the weapon inadvertently. This feature adds an additional layer of safety since the first shot requires a longer trigger pull, reducing the risk of unintentional discharge.

These features work together to enhance the overall safety of the M9 service pistol, making it crucial for users to be familiar with them for both safe handling and effective operation.