No,a runaway is caused by chambering the next round into a red hot chamber,so it cooks off.Having fired probably over 200,000 rounds out of the 60's i can say it was a fine weapon.Those who bad mouthed them either didnt know what they were doing,or had never fired one.
Really? How does a cook-off cause the bolt to bypass the sear and sear notch on the op rod? Provided the trigger is not depressed at the time.
A cook-off is not the same as a run away gun.