chiefdave, while the Glock is a very safe design, the most dangerous time is during reholstering. With your thumb break holster, be VERY cautious that the long outside end of the thumb break strap that goes over the back of the slide does not enter the trigger guard while inserting the pistol. I have seen that happen on the firing range. The trigger cannot tell the difference between a finger or a piece of leather that presses on it as the gun is pushed down into the holster pocket.