I use lithium grease. Worked fine for Poncho when he taught me, still works for me.
Just a smear on the piston o-ring, same for inside the piston sleeve, a light touch on the piston rails, and on the pivot points of the gears.
It should not be more than that. Not needed anywhere else.
If you have a GBB, put a very light coating on the slide rails. That's it.
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