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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