Properly manufactured and finished metal doesn't have "pores." I know this claim is used by lots of lube companies, not only for firearms but also for car engines, etc., but it's misleading. There are microscopic surface irregularities, but not "pores."
There are some pricey firearms-marketed oils that are quite awful, but they aren't as commonly sold or purchased any more. And tons that are OK but overpriced.
ATF (transmission fluid, not the agency) and motor oil will work. SLIP2000 in all its varieties is pretty good, nontoxic, and doesn't gum up or cause any problems I've noticed. It DOES seem to disappear after 1-2 years in storage, but that's not the end of the world. I imagine go-juice is good too, but given the 8-10 brands of lube I still have on hand from past experiments, I haven't bought any yet.
I'm not bashing ALG go-juice and reserving the names of outdated products I would bash, but it's just not worth getting hung up on this. Choose a well established product, or motor oil, and call it good. Just be skeptical of anything that's supposedly a miracle oil AND edible too, and marketed by operators from tier-0 units so secretive that if they told you the unit name, Space Marines would have to kill you.
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