My current Blend is I believe a 50/50 blend of 0W 20 Royal Purple synthetic motor oil and 0W 20 synthetic ATF probably Dextron III or higher.
I am using the Royal Purple motor oil for the color, Mobil 1 works fine.
I seriously doubt that most gun oil you buy are superior to this blend.
Lucas Gun Oil is Very Popular in my area. Buy a bottle of it, and then mix up a 50/50 batch of 0W 20 synthetic Mobil 1 motor oil and 0W 20 synthetic ATF (Dextron III). Now try them side by side and tell me which one is a better oil. I am sure you cannot tell the oils apart by looks or in use. I buy the Lucas myself to have the bottles when empty to refill with my blend. I do use them both, and cannot tell any difference in them at all other than the cost.
The Lucas Gun Oil is very good oil, and I highly recommend it for those buying Gun Oil.
If I were a betting man, my money would be on the bet that most commercial Gun Oils are either marketed for some other use and repackaged as Gun Oil, or are a blend of readily available products like motor oil and ATF.
Now I am not saying to not buy specialty lubricants. I do use the Remington Dry Lube, and a special grease for stainless steel on my SS Colt slide. I have a box full of different gun oils in the shop that I have bought to try out, and do not use anymore. None that I would rate as Bad, but none that I find to be an improvement over Lucas Gun Oil OR my 50/50 Blend.
Kinda like Gun Scrubber and Brake Parts Cleaner. I use them both for hosing out my AR15-22, and other things that are really dirty before I get started cleaning them. Is one better than the other for hosing out a filthy action?? I am not sure myself and I use them both.
Bob