Which safety feature allows for reducing tension in the firing mechanism without firing?

The decocking safety lever is a feature designed to safely lower the hammer of a firearm without discharging a round. This mechanism allows the user to reduce tension in the firing mechanism while ensuring that the firearm remains safe from accidental discharge.

When the decocking lever is activated, it typically disengages the sear or allows the hammer to fall safely, which means that the firing pin is not struck. This feature is particularly beneficial in situations where a user may need to handle their weapon without the risk of an unintended discharge, such as when holstering the firearm or transitioning between safe and ready modes.

In contrast, the half cock safety notch, safety trigger, and cocking indicator serve different functions. The half cock notch allows for a secondary position for the hammer which provides a level of safety during the cocking process, but does not actively decock the firearm. The safety trigger prevents the trigger from being pulled unless certain conditions are met, and the cocking indicator signals whether the firearm is cocked or not, but neither of these features directly reduces the tension in the firing mechanism like the decocking safety lever does.