Stain around rear Colt 1911 sight

[38snapcaps]

My new 1991 NRM had some bad scratches on the slide so I sent it into Colt for refinishing. It came back beautiful except for some kind of light stain on the top of the slide around the rear dovetail sight. Its brown in color and almost looks like dried glue. I tried cleaning it off with gun oil and a light household oil to no avail. I even gently scratched at it with a toothpick which didn't work either.

Can anyone tell me what it is and how to remove it without harming the finish?

 

[PinnedAndRecessed]

My new 1991 NRM had some bad scratches on the slide so I sent it into Colt for refinishing. It came back beautiful except for some kind of light stain on the top of the slide around the rear dovetail sight. Its brown in color and almost looks like dried glue. I tried cleaning it off with gun oil and a light household oil to no avail. I even gently scratched at it with a toothpick which didn't work either.

Can anyone tell me what it is and how to remove it without harming the finish?

I believe I'd call Colt's service department and ask them. The squeaky wheel.....and all.

 

[Black_Talon]

I'll bet you a dollar that it's just bluing salts leeching out from underneath the sight. Use your favorite cleaning solvent to clean it out. If you have the use of an air compressor, try blowing it out as well.