When I was putting the barrell back in...it was not set in correctly, so I took it out (the barrell). When I took it out, it was kinda stuck. So I had to pull it out with a little bit of force. Yes the O-Ring is seeded in a bit...but it can still be cut if you put enough pressure on it and cut it on metal.
But like I said....user error. It was my first time taking about my HK45 or any handgun for that matter. I took it apart 3 times after that without any problem. So it was user error.
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