Overpressure reloads or factory, but since it was the 4th time, I'd say poor attention to detail while reloading. I shoot +P+ out of my scorpion all day long and the heavy bolt barely moves faster, and it was designed as an auto subgun, and this is the internet folks. I could run over the scorpion with my six thousand pound SUV and it wouldn't break like this. Internet nonsense or repeated stupidity.