It blows me away how much controversy boils up every time someone asks a simple question about cleaning a rifle.
My first reaction: I'll never understand why so many guys ask how or when to clean a machine as if it fell from the sky. If you buy a commercial AR, it comes with a manual that tells you how the maker of that firearm expects it to be cleaned a lubed. WHY THE RELUCTANCE TO DO WHAT THE MAKER SUGGESTS? If you bought a used AR, or whatever else, the Army and Marine Corps manuals are available free on the web. Why not check them out?
Secondly, I'm always dissappointed at how many guys get pissed off and hostile about this or that preference. I mean, after all, don't we have enough real enemies out there that we don't need to bite each others' heads off if the guy next to you doesn't do exactly the same thing to clean his piece? Save it for the anti-gunners, the invaders and the late-night intruders, right?
Since buying my first AR15, I have cleaned all of them (I now own four) the same way: I do exactly what my USMC manual says to do and I do it every time I shoot. I know I could skip a cleaning and the rifles would work fine but I'm not under fire when I get home from the range so why not take care of my weapons?
I wipe them down but I don't worry about every little scratch. And I have not experienced one single malfunction of any kind whatsoever.
It's just my personal choice but it seems to work.
Good shooting.