I never carried one in country, but I saw guys pee on the bbl to cool it down. However, I was a tacticts instructor at Camp Geiger in 1970 and during a live fire drill at the infitration course, we managed to burn 3 of the up. Head in structor said "fire in 3 to 5 round bursts. Yea right, we three instructors each had linked together 2 200rd belts per gun. Got them so damn hot you could take your finger off the trigger and they kept on firing. Had to twist the belt to jam them so they would stop. Next time at the range they gave 1917 Brownings, water cooled. Couldn't break those bad boys.