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The safe action is a group of safeties that prevent the gun form firing unless the trigger is pulled https://us.glock.com/en/learn/glock-pistols/safe-action-system

Safe action are a series of safeties that ensure a pistol won't fire barring a trigger pull. Double action is a pistols ability to attempt firing again if a primer does not fire by pulling the trigger again (2nd strike Capability) without having to manually rack the slide.