A decocking lever or “decocker” is a mechanical device that safely disengages the hammer from being cocked. In addition, the firing pin block prevents said hammer from discharging the firearm when you’re not shooting. It can also be activated by pressing down on its handle with one hand while taking hold of your pistol’s trigger guard with another- this will move both backs into their original positions, so they’re ready for use as soon as you need them again!