A double action revolver is a type of firearm that can be fired in two ways: by pulling the trigger or by manually cocking the hammer. When the trigger is pulled, it both cocks the hammer and releases it, allowing for quicker shots. This mechanism makes it easier for the shooter to fire multiple rounds in succession. These revolvers typically hold six rounds in a rotating cylinder and are known for their reliability and simplicity. They are often used by law enforcement and for personal defense. Popular models include those made by Smith & Wesson and Colt.