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冲锋枪，泛指使用手枪子弹的连发枪械。由于射速高、火力猛、结构紧凑等特点，常用于冲锋陷阵或者近距离接战，是轻武器的几大类别之一。然而你知道吗？二战中美国的主战冲锋枪M3风评并不好，甚至一度被讥笑为“注油枪”，这又是怎么一回事呢？

1939年9月1日，纳粹德军闪击波兰，大量坦克的实战表现清楚地向美国将军们展示出纯机枪武器的无用性，因此美国必须加快研制一种配备火炮的新型轻型坦克。M2A4轻型坦克就这样诞生了。从一开始，它们的主要用途就是训练，装备美军之后几乎立刻进行改进。1940 ...