I'm convinced that gun oil and brass tumbling method/media are the two most divisive topics of our day.
This issue used to be more important, but a lot of today's carry handguns are polymer framed with nitrided (or whatever marketing term they can use to get you to think it's better) slides. How important is it really to protect against corrosion? It's not like you're leaving your guns outside. I'm sure there's some "schweddy" dudes out there carrying IWB but there are a ton of products that do about the same thing.
So, a couple of years ago, I actually found some discounted Lubriplate FMO-350 (the product Grant suggests) that was on sale because it was almost expired. No, it wasn't the AW stuff. I'm not going to eat it either, so why not at least try it, right?
I have to say it's pretty good as a L&P. It's not a Cleaner, but who gets everything in life? It's clear and more importantly odorless. It doesn't have a scent, like most petroleum based products. Have you ever smelled old-man cologne on someone? By "old man cologne," I mean Hoppe's #9. At least if they had a fanny pack it would contain the scent better - haha.
I'm in it for the long haul with FMO-350 because a gallon is probably a lifetime supply. I would recommend it if you could get it on sale. I don't think it's worth it at full retail. It's thicker than RemOil and thinner than maple syrup. My special applicator is a toothbrush.
To each their own on this one. Snake oil, special grease, whatever - go for it and try it........................................................................................but chainsaw oil is nasty IMHO.
BTW, I also dry tumble with crushed walnut and used dryer sheets and am completely content with it - haha.