My own MP9c has scratches on slide wall as attached. I just found after firing with FMJ 239 rounds (85 days since purchase). What happen?
Someone told me it's come from manufactring process. Oh...How about S&W QC process?
If caused by scratch of slide and barrel, from my investigation: no any rub and/or scratch on the barrel.
If scratches caused by bullet case, it's impossible, because the level of the hardness of slide and bullet case is so different.
Please give me an idea and recommendation.
Someone told me it's come from manufactring process. Oh...How about S&W QC process?
If caused by scratch of slide and barrel, from my investigation: no any rub and/or scratch on the barrel.
If scratches caused by bullet case, it's impossible, because the level of the hardness of slide and bullet case is so different.
Please give me an idea and recommendation.

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