I think this issue's been brought up informally but I figure it best to make an official post since I absolutely love the m60 and would love to see use for it in MP without the need to spawn it, since it's much more fun to find on it's own naturally.

I've gone through many, many firearm locations in my rather late game save at the moment in MP and have not seen the M60 and related items, MK-23 nor AK-47 spawn in recent time (seems to have been replaced with the MAK-90 in terms of loot as that's the only thing I'm finding). I've done some research as well with refilling loot containers and have gone through the table of items, it hasn't showed up in the face of other rare items like the MAC-10 which spawned a decent amount of times during my testing.

These items I'm capable of finding in Singleplayer as intended but in MP it's been a total no-go and I'd love to see a fix for it sometime soon as it's especially fun to use these weapons in the multiplayer environment. They exist in the items tab and can be given via Admin just fine but it's simply a lot more fun to find them out in the wild.