I have been using TW25b grease on the areas where the toggle train interfaces with the upper receiver. It is a bit heavier than an oil, and it stays put. I have been using this on all of my shooter handguns for a number of years with no complaints. New Sig handguns come with a tube of it in the box. Other gun companies may also, I don't know. I, personally, don't think that oil alone is enough of a wear preventive/lubricant for those areas. YMMV
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