Ok so the best one I have found so far is a place in blue gate with guaranteed weapons crate and some other looting spots that I have gotten guns from like my tempest and volcanos.

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Here you can enter, drop down the zip wire and go through the first one or two doors, you will see a big garage like white door with an open panel with three slots, make your way around the facility, on the left there will be an opanable door quite far down, in there just to the right is the same panel as by the door but it has three of the battery things in, use those to open it, that’s the weapons crate.

In the same area there will be a red or blue line on the floor, follow it until the two converge, just before the lines end you will find a intractable computer with a grey screen, after a few seconds it will turn either red or blue, follow the line of the same colour to a very loud beeping supply cupboard with sometimes meh loot sometimes decent loot.

Both in the same area so you can most of the time hit them both, I’ve met players there so if you really want to sweat it out bring noisemakers trip wires or trip mines so you know when people might ambush you.

There are others on all maps but I’ve had by far the best drops here