It’s a type of firearm trigger that performs two actions, such as releasing the hammer and firing the gun. It contrasts with a single action trigger, which performs only one action, such as releasing the hammer.
Double action triggers are usually found on revolvers and semi-automatic pistols. They are designed to provide a more consistent pull weight than single action triggers, which can make them easier to shoot accurately. However, they also tend to be more difficult to pull, which can make them more challenging for new shooters to operate.
Martin Mapa Edited answer September 9, 2022