7.62 39mm 步机枪弹 53式7.62×39mm步枪弹 56式7.62×39mm步枪弹这两种子弹的区别

53式7.62×39mm步枪弹 56式7.62×39mm步枪弹这两种子弹的区别 53式步机弹的规格是7.62x54mmR.56式步机弹的规格是7.62x39mm。53是凸缘弹，56是无底缘弹。。关于7.62*39mm，7.62*51mm和1...