During aiming, the shooter aligns his/her line of sight past a gap at the rear sight's center towards the top edge of the front sight (which is usually shaped as a small post, bead, ramp, or occasionally, a ring), forming a line of aim that points straight at the desired target. Iron sights are typically composed of two components mounted perpendicularly above the weapon's bore axis: a rear sight nearer (or proximally) to the shooter's eye, and a front sight farther forward (or distally) near the muzzle. The earliest sighting device, it relies completely on the viewer's naked eye (mostly under ambient lighting), and is distinctly different to optical sights such as telescopic sights, reflector (reflex) sights, holographic sights and laser sights, which make use of optical manipulation and/or active illumination, as well as the newer optoelectronics, which use digital imaging and even incorporate augmented reality. Iron sights are a system of physical alignment markers (usually made of metallic material) used as a sighting device to assist the accurate aiming of ranged weapons (such as a firearm, airgun, crossbow or even compound bow), or less commonly as a primitive finder sight for optical telescopes. The annular shroud around the front post sight is aligned with the rear peep sight to ensure the firearm is properly trained. Sight picture through iron sights of an H&K MP5 submachine gun.
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