This is just my opinion, I'm sure you could get a thousand different. I like to use white lithium grease or Tetra grease on the tail of the bolt just behind the rings up on the slope, it makes it easier to clean when it comes time. When cleaning I'll squirt the parts that don't move around much like the mag release and bolt catch with WD40 or CLP, rem oil etc.
I use Mobil 1 on the trigger and hammer pins and sears and on the rails of the carrier.
Some of the thinner oils evaporate quickly and must be applied more often, grease on the carrier rails can collect sand or grit so I try to stick to the middle of the road for lubes.
It really depends on how much you shoot, someone firing 100 rounds at a range in one day doesn't need much lube while I have watched 3 gunners squirt WD40 into the port and onto the carrier until it ran out of the barrel. The main thing again IMO is just don't let the carbon gum up the bolt and carrier to the point it slows down the cycle.
5.56, 6.8, SIX5. The Nexgen of 308s
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