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The SAFE ACTION® System is a fully automatic safety system consisting of three passive, independently operating, mechanical safeties. ... The trigger safety is designed to prevent the pistol from firing if it's dropped or if the trigger is subjected to any pressure that isn't a direct firing pull. So it's just describing the safety features, it has 3, trigger safety, firing pin safety and drop safety. Hope this helps.

Keith, Safe Action is the actual internal safety features built into Glock Handguns. Avery informative demo/visual video here : https://www.youtube.com/watch?v=V2RDitgCaD0