A highly competitive IPSC shooter gave me a bunch of Break Free many years ago because he said he didn't want it to touch any of his guns. Don't remember the reason or if he gave me one. Most products that try to do everything don't do anything real well. WD-40 is great for many things but it is only "OK" as a solvent, lubricant, or rust preventer. I like to use Remington Shotgun Cleaner to quickly clean my guns and then spray on some Remoil as lubricant and rust inhibitor. If a gun really needs some slicking up on the internals I like a tiny bit of "Bear Grease" and for a real good cleaning I field strip and soak parts in Hoppes then scrub them.