again not to argue with anybody I was in the Marine business for quite a few years. I saw what WD-40 will do to an engine compared to CRC 656. WD-40 was tested and it was found that WD=40 does in fact drawl moisture out of the air. it doesn't wisk it away it captures it. It is like a shammy cloth though it will drawl more moisture than it can hold. There for allowing that moisture to lay on the metal WD_40 will then also disipate adn leave the moisture behind. They don't tell you that though. AGain I would never use it on my firearm I would use Rem Oil or a lubricant made specifically for firearms. Pat