WD-40 is a great protector. The only thing about WD-40 is leave it in a bore or continue use of it and it will get gummy.I actually think the stuff attracts dust. Ever see how much dust is in a bore of a barrel that has sat around for a long time? Add a wood stove in the house and it only gets worse. I never use WD in actions of my semi automatic pistols or rifles. But WD-40 will remove water, and will protect metal. I used it for years when I was younger. That's how I learned the hard way about it gumming up the actions on the pistols.