I'll have totake a different path than most of you. Been using WD-40 on the exterior metal of my firearms for 20 years with no problems.Try this test, take 2 pieces of scrap metal and hit them with a wire brush or grinder to get them shiny.Putyour favorite gun oil on one and WD-40 on the other. Then put them outside in the elements for a couple of days. If no rain is in the forecast then hit them with the sprinkler. After a couple of days see which one has more rust on it.


[/align]