My brand new M9 has marks similar to those. It just looks like where the steel was formed. I actually got my pistol the day before this thread was posted, so of course I checked it out when I saw this thread. I had only fired 10 rounds from it the first day, but the marks were there. I have about 200 through it now, and it hasn't gotten any worse. I don't think mine are a problem.
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”Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars.” ~Unknown
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