What cleaner/lube to use for new AR

[rwh]

I'm still on the same quart of Mobil 1 5W40 I was using when this thread started. I use a precision oiler for RC cars to put a few drops along the places where the receiver touches the bolt carrier and a little around the bolt and so far so good. A few drops of oil goes a long way. I expect a quart of oil will last me 20 years unless my hinges start squeaking.