Never had that happen. I did get it so hot a couple times that the barrel actually droupped. I also had a round cook off while the barrel was laying on the floor of the ship. When we flew SOG and the PLei-Trap I used a mini-gun ammo box for my gun. The trouble with it was the ammo was in the box backwards from the way the sixty would feed. From the box into the ammo trays on the gun ship it was fine but into the sixty you have to unload the box onto the ground and then reload it into the box. 1500 rounds of ammo laying on the ground and than trying to get it back neatly into the box when you were in a hurry at times was a chore. Ask Bob about the new gunner he had whose barrel fell off one day in the valley. The valley was bad enough but than to have one gun not work. I think Bob had to trade his first born to get a new barrel that day.