Which safety feature of the M9 requires the user to be cautious before firing?

The decocking/safety lever is a crucial safety feature of the M9 that requires users to exercise caution before firing. This lever serves two primary functions: it allows the user to lower the hammer safely without firing a round, and it also acts as a manual safety to prevent the trigger from being pulled when engaged.

When the decocking feature is used, the hammer is safely lowered onto the firing pin block, which ensures that the firearm cannot accidentally discharge while being carried or handled. However, if the user forgets to engage the decocking/safety lever before they intend to fire, the gun could potentially go off unintentionally, particularly in scenarios involving a double-action pull.

Understanding how to properly use the decocking function is vital for maintaining safety protocols while handling the M9, making it essential for users to be cautious and familiar with its operation to prevent any accidental discharges. This highlights the importance of training and awareness when operating the firearm.