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The solvent in WD-40 evaporates away and then just leaves a thin film mineral oil trace.
Any PH neutral oil that blocks out moisture and air will prevent rust and corrosion from forming on metal.
That having been said there are modern synthetic lubricants that are far more "slippery" and "friction reducing" than mineral oil and will stay put better and longer.
So while there is technically nothing wrong with WD-40 there are more effective gun oils out there these days that are specifically tailored to firearms.
I really like WeaponShield CLP but, Gunzilla is getting rave positive reviews from everybody that tries it.
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