You don't want lube on the piston, it's not moving against anything and the lubricant will just cook onto it.
You want to put some light lube on the two lower rails that the bolt carrier run on, and the two "upper rails", which are the top of the receiver visible after taking the dust cover off.
Also, a light coat on the bolt itself, specifically the locking lugs and the "tower" or body of the bolt that rotates in the bolt carrier.
A little lube on the disconnector/hammer interface is also a good idea.
I wouldn't put liquid lube on the recoil spring assembly. If you do, it will shoot out of the take down cut out of the dustcover and come right back in your eye/glasses.
Hope that helps.
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