What does the UP position of the decocking/safety lever indicate?

The UP position of the decocking/safety lever on the M9 service pistol indicates that the weapon is ready to fire. When the lever is in the UP position, it means that the pistol is in a "fire" mode, allowing the user to pull the trigger to discharge the weapon. This position signifies that the firearm is loaded and has not been decocked, ensuring that the hammer is in a position to strike the firing pin and ignite the cartridge.

Understanding this function is crucial for safe handling and operation of the M9. In practical terms, when a user sees the lever in the UP position, they should be aware that the firearm is prepared for immediate use, reinforcing the need for heightened safety vigilance when handling the weapon.