Anybody here have any good (and safe) recipes for gun lubes that has been working for them? I am thinking of experimenting with some of the recipes I have been seeing on the various gun forums. My only concern is that some of these auto part or lubricants for various applications may contain certain chemicals harmful to the longevity or polymer parts of my firearms. For example, one guy on a forum who works in the oil industry warned people against using Marvel Mystery Oil on guns as it contains "Chlorine (not Chloride)" and can result in the formation of Hydrochloric acid that can damage the guns over time. I'm wondering what simple and cheap lube recipes people have come up with that they have verified are safe for use on their AR and polymer framed semi auto pistols? As of now, it seems a Synthetic ATF oil (less gnarly smell than ATF such as Dextron) mixed with a 10w30 oil, maybe cut down with a bit of Canola etc are pretty popular. I've also seen people who have used Marvel Mystery Oil and STP in their gun lube recipes. I'm really not sure which ones are the best to try as I have only used store bought lubes so far. I don't want anything risky, overly toxic or with a real gnarly smell. As much praise as I see for ATF fluid, I see plenty of others who cannot tolerate the smell. I have heard the synthetic ATF fluid has much of the benefits of the non-synthetic, but without the horrible smell. I like my Slip 2000 and it keeps my AR bolts wetter than Break Free for same amount of usage, but its damn expensive. I am wondering what safer alternatives I can try. It would be interesting to hear the suggestions of those with some time tested recipes they have "personally" used. I'm pretty wary of oils like STP or MMO. Some people on forums even went as far to say they use things like acetone in their mixtures.. Obviously, that could be damaging to my ARs and poly framed guns. I guess I am looking for some posts from the wise here..