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五十年代,美国就着手进行了一系列特殊的轻武器研究项目,打算改进轻武器的射击效果,並减少当时制式轻武器的品种。这些研究项目是“齐射”、“锥膛齐射”和“斯普尤”(特种用途单兵武器)。根据这些方案研制出了一种特种枪弹,这种枪弹在很大程度上,使美国和其它非共产党国家以后的步枪和枪弹的发展发生了巨大的变化。这种枪弹就是.223英寸枪弹,现在一般公认为米制5.56毫米×4_5枪弹。五十年代的“齐射”项目包括5.6毫米高速弹药,这种弹药性能良好,从而鼓舞美国军界不太保守的人物以敦促进一步的发展。当时美国军界官方态度是,尽管研究项目很早提出
In the 1950s, the United States embarked on a series of special light weapons research projects aimed at improving the shooting effect of light weapons and reducing the varieties of contemporary light weapons. These research projects are “Salvo”, “Cone Volley” and “Spruce” (special purpose solitary weapon). According to these programs, a special type of bullet was developed which, to a large extent, has undergone tremendous changes in the development of rifles and bullets since the United States and other non-Communist countries. This bullet is a .223-inch bullet that is now generally accepted as a metric 5.56 mm x 4_5 cartridge. The “volley” project of the 1950s included a 5.6-mm high-speed ammunition that performed well and encouraged less conservative figures in the U.S. military to press for further development. At that time, the official attitude of the U.S. military was that although the research project was proposed very early on