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图为美国CMMG活塞导气式M4卡宾枪。将AR系步枪由原来的气吹式改为活塞导气式已经成为一种潮流,自不必多述,而图中该枪的特别之处在于,除了机匣顶部安装有光学瞄准镜外,还通过导轨安装了偏置式的机械瞄具,该设计的本意是使光学瞄具与机械瞄具能互不干涉地使用。但M4卡宾枪采用的是直枪托,使用如图所示偏置于枪身右侧的机械瞄具,使用者就不得不将脖子用力向右扭曲,这个姿势极为别扭,因此偏置于枪身右侧的这种机械瞄具显得有些多余。
The picture shows the United States CMMG piston gas-guided M4 carbine. AR series rifle from the original air-to-piston air conduction has become a trend, since no need to say, and the gun is special in the picture, in addition to the top of the receiver installed optical sight, but also Bias-mounted mechanical sights are mounted on the guide rails, which are designed to allow optical sights and mechanical sights to be used without interference. However, the M4 carbine gun with a straight shot, the use of bias as shown on the right side of the gun mechanical sight, the user had to force the neck twisted to the right, this position is extremely awkward, so biased in the gun body This mechanical sights on the right seem a bit redundant.