The term iron sights refers to the open, unmagnified system used to assist the aiming of a guns/devices, usually those intended to launch projectiles, such as firearms, airguns, and crossbows; they are also used on many telescopes to help point at a desired target. Iron sights typically comprise metal blades and usually have two parts, a rear sight mounted vertically crosswise to the line of sight and consisting of some form of notch or aperture, and a post, bead or ring front sight. Civilian defensive and hunting firearms and police weapons usually feature open sights, while military small arms of the Western armies (meaning the NATO bloc) are most often outfitted with aperture sights. On many firearms the rear sight is adjustable for elevation or windage.

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