Unsupported chamber

[yoitsbruce]

whats glock bulge ?

[HighLander51]

Glock bulge is, typically, the result of 40S&W fired from a Glock. There is a slight bulge at 6 o'clock as a result of the case not being fully supported by the barrel, as opposed to 40S&W being fired from a 1911 gun, where only part of the ramp is in the barrel, and the rest is in the frame. That's why most USPSA shooters running major power factor use STI/SVI platforms.