Unsupported chambers
It should be also noted that .40 S&W is not the only round that has this issue. I have also found quite a few references to 9mm, 357 sig and even .45 ACP. When you have high pressures and an unsupported chamber you can have this issue. It seems to be seen most often in early Glocks, perhaps due to the numbers sold and the unsupported chambers of the earlier guns. A quick google of "unsupported chamber 9mm" will give quite a few links and images.
As an FYI, I have no issues with shooting either 9mm or .40, but after my G23 experience, I do want to know the details of the chamber support and load before pulling the trigger.
My Shield .40 has much better support than my G23. I also have a LWD 9mm conversion for the G23 that has good support.
It should be also noted that .40 S&W is not the only round that has this issue. I have also found quite a few references to 9mm, 357 sig and even .45 ACP. When you have high pressures and an unsupported chamber you can have this issue. It seems to be seen most often in early Glocks, perhaps due to the numbers sold and the unsupported chambers of the earlier guns. A quick google of "unsupported chamber 9mm" will give quite a few links and images.
As an FYI, I have no issues with shooting either 9mm or .40, but after my G23 experience, I do want to know the details of the chamber support and load before pulling the trigger.
My Shield .40 has much better support than my G23. I also have a LWD 9mm conversion for the G23 that has good support.