Adding lube like that to the fire control parts is asking for dirt build up for nothing gained.
You can lube a trigger/hammer pin - but other than that - you just adding lube for no sake.
- buffer tube
You shoul dhave some lube on the spring -- it will reduce friction, and help preserve the springs effectiveness under high cycling (springs heat when cycled and added friction creates more heat.
BUT not a tone of it
Cleaning
I tend to use MPro-7 cleaning kits - as I have a few since they where the only ones Brownells could ship to Iraq (they have no hazmat)
- here at KAC - we use KG Carbon Cutter, Hoppe's9 Copper cleaner, and TW-25B.
We also have piles of lubes that snake oil salesmen send to us.