aperture rear-sight disc觇孔盘
rear sight hindsight枪炮上瞄准装置的一部分
notch of rear sight照门
rear sight aperture觇孔式照门
tubular rear sight管式表尺
rear sight adjustment drum后准星调校器
rear sight base表尺座
Rear sight leaf卡片表尺板;表尺板
Rear sight screw照门螺钉
N（名词） the sight of a gun nearest to the breech (枪的)后瞄准器