After going back and re-reading this thread there's an old phrase that comes to mind:
"Much to do about nothing."
Some people get more out of certain information than others, that's the nature of life. Me, I learned something. Back in my Quality Days we had a saying "When in doubt, check it out," so that's what I did.
I must admit that I did use the wrong word in the title of this thread when I chose "coating." Here's the line of thought I was following at that time. My van has a paint finish on it and when I go down a muddy or dusty road it usually picks up a coating of mud or dust. It's not something in the design, but it's there nonetheless.
I had a feeling that the copper color wasn't a "finish" but a "coating" (see above) and while I may have used the wrong word, technically speaking it's an oxide, at least my train of thought was on track.
With that said, I did learn that the oxide that I had seen flake off when testing it's adhesion to the part is simply a by-product of the manufacturing process, which begs the question, why is it left on there afterwards?
The main thing I learned, and I thank Scott for this, is that by me removing that copper colored oxide I didn't harm my parts. I probably enhanced them by making them slicker and removing any possibilty of this oxide coming off in my firing pin channels like I had seen it come off on a paper towel.
You can say what you will, allglock's photo of his firing pin has me wondering about long term durability, especially since he says it's on more than one pin. "When in doubt, check it out."
There is always varieation in any manufacturing process and no matter how hard a company tries, the best they can hope for is what's called a "Stable & Predictable Process." This doesn't mean a process is perfect, none are, it simply means that you know what to expect along the way and once you understand & accept the fact that you will generate some bad parts from time to time, you can deal with it more effectively. When it's a visual defect they are usually easy to remove from the process, in the case of metallurgical issues things are much tougher to detect and it might just be a case of allglock getting parts from a "bad batch." It happens, I don't care what anybody tells you.
One good way to learn for sure what's going on would be for Apex to get those pins back from allglock and do a little testing, which should generate data that could help their product in the long run.
tomcatt51, just so you don't come away from this thread empty handed, the old phrase goes,
"Much ado about nothing."
