I have been playing this game a lott the last five days ( vacation time :D ) and I have been to all the bases several times and all weapons that spawns are MP5, FX45 and SKS, no assault rifles. I did get one M4A1 but that only to a helicopter spawn. Outside of that I have never seen one, not even on players, kinda makes me a lion amongst sheep really, but it is boring.
I think the loot economy needs to be reworked, because I think that the problem is that one or two group manages to find let's say all 40 (or so) AK's (or KA in your game) and that's the only ones that can exist on a server (or hive), and that group hides them in boxes buried in the ground, it's pretty much impossible for other other people to find them, especially if they can transfer them to a new server in the same hive(?).
So whats up, why are they not spawning?