Response to your question has begun to appear at the other thread you started, on this same subject.
Click on: Slide Discoloration??
So I just bought a brand new SP2022 9mm the other day, and I took it out once and put 150 rounds through it. When I got the gun, it was all black, but I just now realized that the whole slide of the gun is like a greenish grey looking color now. Does anyone know why it's like that and/or what I can do to fix it? Links to a picture is posted below
I got it in black nitron and the gun was all black until this morning.
Any help would be much appreciated!