The old direct impingement (as opposed to piston driven) ARs were supposed to well oiled to be reliable. Especially in far away jungle lands.
Mine get well oiled to shoot, but not dripping/running with it (it will get on your face and eyes that way, even with glasses

).
All firearms need judicious lubrication, but what and how much varies.
My (superior) gunsmith (80yo) always returns any firearm serviced completely free of lube. I have no idea how her does that.
Sadly, my Marlin 1894 .44 Mag is rarely fired. But it has oil on and in it.

I met your Farside buddy Kieth at Roanoke Inzane and he told me of Judy's fall, and I was sorry to hear about that. And I missed visiting with you too. Another time.