觇孔瞄准具 Aperture sight ; [军] sight aperture

孔径瞄准具 [军] aperture sight

反光小孔瞄准 reflex boresight

射孔器瞄准装置 gun pointing device

瞄准器小孔 view finder eye

辅助瞄准孔径 auxiliary finder aperture

瞄准装置孔径 finder aperture

六分仪瞄准孔 sextant sighting window