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I am starting to get the idea its some kind of factory grease or preservative. I can see a very small amount between the backplate and slide...also, there was a faint amount of this on the slide rails, but that came off easily. Nothing I am doing is making it come off. Maybe shooting a few hundred rounds will help between the heat and gunpowder residue that it will collect.Irizavrima, Welcome to the Forum.
I'll bet a solvent like said or Rubbing Alcohol if you have it might remove it. Like you I'd bet it was something other than "rust". The sight white appears to be glowing.....good.
bob
Would a wire brush scratch the oxide and black finish off the slide?Bore solvent cuts old grease pretty good View attachment 978
A brass brush is also handy.
I have done everything possible to get in those corners and it is not working...A bronze brush if used gently usually is ok