Its all about training, and building up muscle memory. You buy a new holster, you practice drawing from it and over time you get to know the in's and out's of it. Same goes for guns and really any piece of gear.
As long as your finger is outside the trigger guard prior to firing that's your safety. Glocks and any other defensive hand gun are built around operator proficiency. Know your gun inside and out, if not having an external safety makes you nervous move on to another pistol. My 1911's are never on safe at a game, I carry them ready to rock the only time the safety is on is during storage.
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