You can also get a double-fire if the gun is not held tightly against the shoulder, and you are slow to release the trigger. I remember in infantry training, we used to put the butt of the M-1 rifle against our stomachs, and pull back on the trigger, and if you do it just right, your stomach muscles bounce rifle forward, and you'll blow a whole clip like a full auto. A double fire happened to me once later in life during a service rifle competition, and I think that is what happened.
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