It sounds like your question is about when seated in your vehicle? My solution was to devise a holster rig which is mounted on the drivers seat, right in the front, and between my knees. It's on a nylon belt which lets me rotate it downward (and out of sight) when I am not in the car.

When driving (or stopped) the gun is perfectly positioned for me to grab...without any movement that would give away what I'm doing.

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Stay protected my friends.