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WD-40 may make a decent bore solvent, but it makes a VERY poor lube. After the solvent evaporates, it leaves behind a very sticky, gummy residue that attracts and holds grit.
The effect? Think sandpaper. Grit glued to a base is all sandpaper is, and that's what WD-40 creates inside your gun.
But not in mine! I might use WD-40 or some similar stuff as an in-field emergency cleaner, but my guns will otherwise never see it.
As an anecdote, when I worked in a gun shop, the absolute number one most common "gunsmith" job we did was flushing the tar-like residue of WD-40 and powder fouling out of Marlin M-60 .22 rifles. Some of them came in so caked that the bolt would hardly move. After a complete cleaning, we'd tell the owner to never oil his gun again. I doubt that many listened to that, but it's true that the waxy lube on .22LR bullets is all the lube a .22 semi-auto ever needs.
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