Single action refers to the number of things that happenwhen you pull the trigger. In the case of a ingle action, it simply drops the hammer. In a double action you cock the hammer and drop it when you pull the trigger.
Most pistols that are SA are also DA, meaning you can fire it with the hammer back or forward with just a pull of the trigger. The notable exception is the vaunted 1911, which is SA only.
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Fortunato became immured to the sound of the trowel after a while.
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