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A good silicone will have enough film strength to protect your metal gears from undue wear.
When using 2 different lubricants in the same area, you have to make sure that they are compatible or undesirable things can happen. I would suggest using only silicone. Both Moly and lithium are solid lubricants and are used as extreme pressure additives in industrial applications. Not necessary for airsoft gear boxes. Stick with a pure silicone lube.
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