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在庞大的弹药家旅中,有一类枪弹与众不同,它既不能发射,也没有任何杀伤力,这种不会发火的“哑巴”枪弹,正是本文的主角——教练弹。设计和使用教练弹的主要目的是为了减少枪械零件的损伤。如1960年以前生产的国产56式冲锋枪,其击针圆柱部分上有三条纵向凹槽,前端还有击针销凹槽,用以将击针固定在枪机体内。这种结构带来的问题是空枪击发时,由于击针尖碰不到任何东西,冲力都集中在较为单薄的击针销凹槽上,时间一长击针就有可能从此处折断。56式半自动步枪也存在类似问题,由于击针反复撞击击针孔前壁,长此以往, 枪机体可能会出现裂纹。而采用教练弹队后,击针撞在教练弹的假底火上,力量得到缓冲,避免出现上述现象,武器的使用寿命得以进一步延长。
In the large ammunition family brigade, there is a kind of bullets unique, it can not launch, nor any lethality, this will not get angry “dumb” bullets, it is the protagonist of this article - coach bomb. The main purpose of designing and using a coaching projectile is to reduce the damage to the firearm components. For example, the domestic 56-type submachine gun produced before 1960 has three longitudinal grooves on the cylinder part of the firing pin and a striking pin groove on the front end for fixing the firing pin in the body of the bolt. The problem with this type of structure is that when an empty shot is fired, the striking needle is concentrated in the thinner firing pin groove because the striking tip can not touch anything, and it may break off at a time. 56-type semi-automatic rifles also have similar problems, because the firing pin repeatedly hit the pinhole front wall, the long run, the body may be cracked. The use of the coaching force, the firing pin hit the false fire at the end of the coaching, the force was buffered, to avoid the above phenomenon, the life of the weapon can be further extended.