Shot my Glock 19 yesterday and had about 30 rounds left. I left the ammo in the car overnight and temps were below 0. Got to the range around 3pm (single digit temps) and loaded the mag. Pulled the trigger and just heard a click. Slide didn't move at all. Field stripped and the bullet was halfway down the barrel with unburnt powder behind it. I had 130 rounds of prvi m193 and all those went off without a problem.