What gun was most effective in the Holocaust?
Most Holocaust victims died through gas poisoning.
The Machine gun was the most effective weapon in world war one. It killed more than 7million people out of 8 1/2million. Used to protect trenches. It was effective enough that a counter measure had to be developed to overcome it. The tank. Even in WW2, Gen Patton stated that the primary weapon of a tank was it's machine gun, and not it's cannon. Was and still is.