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原AK系武器的机匣盖采用卡装方式固定,存在不牢固的缺陷。而对AK系列武器的现代化改进,颇为流行的方式是用带有皮卡汀尼导轨的机匣盖代替原枪的机匣盖,具体方式要么是在保留原固定方式不变的情况下直接替换原机匣盖,当然这一方式与原型枪一样存在不牢固问题;还有一种方式是改变固定方式,使机匣盖前端安装在表尺座的销孔内,后端仍旧卡在机匣尾部。相对而言,后一种固定方式更稳固些,但实际上仍达不到精确射击的要求。图中的FAB防卫公司AK74M步枪改进型则采用另一种方法加装导轨,其保留原机匣盖不动,而采用了带导轨的上下护手,上下护手通过螺栓安装在原枪的护手外侧,而护手顶部的导轨一直延伸到机匣盖后上方,这样的方式也起到了稳固原机匣盖的作用。另外,该改进型
The original AK system of the machine cover with a fixed card, there are weaknesses. The modernization of the AK series of weapons, rather popular way is to use the lid with Picatinny rail instead of the original gun casing cover, either in the original way to retain the original fixed directly replaced The original case cover, of course, the same as the prototype gun there is not a solid problem; there is another way is to change the fixed way, so that the front end of the cover installed in the meter seat seat pin hole, the rear end is still stuck in the rear of the casing. Relatively speaking, the latter method of fixing is more stable, but in practice it still can not meet the requirement of accurate shooting. FAB defensive company AK74M improved version of the rifle is the use of another method to install rails, which retain the original cover does not move, and the use of the upper and lower guard rails, upper and lower handguards installed by the bolt guns Outside, and the top of the guard rail has been extended to the top of the casing cover, this approach also played a role in the stability of the original casing cover. In addition, the improvement