Heydrich,
You may want to ignore this kind of backing and filling, but I've noticed that subjects like WD-40 (and W.J. Clinton) generate a spectrum of opinions. I've used WD quite a bit, often with good results, not as a rust-preventer but as a lubricant -- one drop at a time from the end of a toothpick. As Karl implied, it has the wicking characteristics of a penetrating oil. It freed up a slightly sluggish sear plunger for me a few months ago, and the plunger remains free today (I just checked it). I've also used regular light gun oil on Luger parts with no problems. Incidentally, the original DWM manual recommended only one lubricant -- Vaseline!
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