WD-40 (Water Displacement formula 40) is okay for some applications, but as a penetrant, it does have an effect on ammo.
Carb Cleaners will remove most of the crud left on by the factory. Don't use brake cleaner!
Then lube with a quality oil. Some people use a "grease" on the slide, but I have found that grease collects gunpowder. Then you have to go back to the carb cleaner.
__________________ Murphy's law has not be repealed.
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