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5．56mm口径的M193枪弹取代 7．62mm口径北约标准枪弹成为美军制式枪弹至今已有40年的时间了。越南战争证明,5．56mm枪弹及发射该种枪弹的 M16A1步枪也更加适合当时越南战场的要求。大约20年前,5．56mm枪弹成为北约的标准制式枪弹,当时的弹头质量从3．56g增加到4．02g,更重的还有被美军命名为M855的“绿头”弹。越南战场统计显示,M193枪弹在丛林地区的近距离遭遇战中杀伤力很强,
It has been 40 years since 5.56mm M193 bullets replaced the 7.62mm NATO standard bullets into US-style bullets. The Vietnam War proved that the 5.56mm bullets and the M16A1 rifle firing such bullets were also more suitable for the Vietnam battlefield at that time. About 20 years ago, 5.56mm bullets became NATO standard-style bullets, the warhead mass increased from 3.56g to 4.02g, and heavier was the “green-head” bullet that the U.S. military named the M855. Statistics on the battlefield in Vietnam show that M193 bullets are highly lethal in close encounters in the jungle area,