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 shooting. This mechanism makes double action revolvers popular for self-defense and law enforcement. These revolvers typically hold six rounds of ammunition in a rotating cylinder. They are known for their reliability and ease of use, as they do not require the shooter to manually prepare the gun before firing. Many models are designed to be compact and easy to carry.