If you run out of ammo and it's a long way to go to the weapons store, let the CAM store come to you!
To do this, you must have at least
7000$
. You will be charged
5000$
To call, pressCtrl + L. Wait a few seconds, a black van (Burrito) will come to you, approach it and stand on the red marker behind the car. Buy everything you need. In order to "remove" the seller, stand on
red marker
and in the menu select the lineDONE!, and he will leave :D Video: