美国从1982年开始执行的先进战斗步枪(ACR)计划,现已进入一个新的发展阶段。美陆军认为,在战斗中,目标往往是隐现、迅速出击的,运动不可预测,暴露时间十分短暂,而且士兵在紧张的战斗条件下,往往产生明显的瞄准误差,因而武器的命中概率也就相应降低。当时美陆军装备的M16A 1式5.56毫米突击步抢存在远距离上杀伤威 The advanced battle rifle (ACR) program that the United States has implemented since 1982 has now entered a new stage of development. In the view of the U.S. Army, in the battle, the targets are often hidden and swiftly attacked. The movement is unpredictable and the exposure time is very short. Moreover, under the intense fighting conditions, the soldiers often produce significant aiming errors and thus the probability of a weapon hitting accordingly reduce. At that time, the United States Army equipment M16A 1 type 5.56 mm surprise raid on the long-range anti-lethal