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P225-A1 slide finish

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Finally got a new 225-A1 classic carry. Love it so far but when I was cleaning out the factory oil I noticed the rail groves on the inside of the slide are rainbow colored like when you excessively heat metal.

Any thoughts if this could this be that the Nitron coating was not fully applied into this area or something like that? Could this lead to problems down the road making it worth sending it back to Sig before I shoot it? I know it is a gun and it will wear, but I am pretty picky about my stuff.

Appreciate the thoughts.
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Pictures?

When the slides are put into the heat treating furnace, they are put on racks. These racks hold the slide firmly as the parts move through various processes, this grip is on the inside of the slide where it is not visible when the gun is assembled. This racking will cause some discoloration to the slide, don't worry about it, the harness of the surface is pretty consistent across the entire slide.

Shoot it like you stole it!
 

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I know hardened steels will blue differently, depending on their hardness. I'm not sure if the Nitron finish on the stainless does the same or not. As Malicious Compliance stated and supported by 12131, the racking used to immerse the slides into the tank could draw enough of the heat to cause the slight discoloring. As the others stated, I wouldn't worry about it. Just put a little grease in them grooves, like you should, and shoot it!
 

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Discussion Starter · #6 ·
I was not clear how the process worked. This makes sense that they need to hold the slide somewhere and it is part of the process. It isn't noticeable on my 226. Can't get a pict that shows it with my available camera.
I know it is stupid but I am just super picky with my firearms.

Thanks again to All!!
 
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