A phrase used to describe the method
of aiming a firearm
Closed aperture sights refers to several different ways of designing and aiming a firearm. On a closed aperture sight, the rear sight is usually either a pin-hole sight or some other complete circle-forming piece of metal. Looking through this device, in effect, seals off the rest of the distracting world and gives a clear view to the second sight, which is used to point the barrel in the correct direction of discharge.
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