I fully know that this is in contention but being old gives me some license to say what I think.
With one caveat, WD-40 should never come closer to a gun than vermouth comes to gin.
If one wishes to free up a rusted part, it has some place but far below BreakFree.
If allowed to remain in moving parts until dried, it will cause more problems than is solves.
I sincerely advise it not be used on guns and other fine working mechanisms. It is NOT a lubricant and has no lasting quality other than becoming a hard coating that gums up the works.
All one needs is an oil and then clean with an oil remover.
Best,
John
