So I found a glitch in Ammu-Nation and it teleported me into the roof of the building. Once in there you are trapped, but I ran into the sides of the walls and eventually fell through the map. I opened my parachute and then it teleported me back to the top of the map after a few minutes. How I did it was I drove an suv into ammu nation and stopped it on top of the counter sideways, then I tried to exit and it happened.

Proof -
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