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  2. PSO-1 - Wikipedia

    en.wikipedia.org/wiki/PSO-1

    The scope body is sealed and filled with nitrogen, which prevents fogging of optics and was designed to function within a -50 °C to 50 °C temperature range. For zeroing the telescopic sight the reticle can be adjusted by manipulating the elevation and windage turrets in 5 centimetres (2.0 in) at 100 metres (109 yd) (0.5 mil or 1.72 MOA ...

  3. C79 optical sight - Wikipedia

    en.wikipedia.org/wiki/C79_optical_sight

    M145 Machine Gun Optic fitted to a M240B machine gun. The M145 Machine Gun Optic is a variant of the C79 that was developed for the U.S. Army and is commonly mounted on M240 and M249 machine guns. The M145 is unusual when compared with other optical sights in use with the United States military in that ballistic compensation is in the mount ...

  4. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.

  5. M21 sniper weapon system - Wikipedia

    en.wikipedia.org/wiki/M21_Sniper_Weapon_System

    The M21 remained the Army's primary sniper rifle until 1988, when it was replaced by the M24 sniper weapon system; some M21s were later re-issued and used in the Iraq War. [12] [3] In standard military use, the M21 uses a 20-round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg) without the scope. [13]

  6. Boresight (firearm) - Wikipedia

    en.wikipedia.org/wiki/Boresight_(firearm)

    The user then adjusts the iron sights or scope reticle to align the point of aim with the projected laser dot. Another more commonly used type of laser boresighter is attached to the muzzle of the barrel, either inserted straight into the bore ("arbor" type) or held in alignment with the barrel via a magnet, and projects a laser beam onto the ...

  7. Heckler & Koch PSG1 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_PSG1

    PSG1s are not supplied with iron sights but come equipped with the Hensoldt ZF 6×42 PSG1 scope with an illuminated reticle. The scope has a built-in bullet drop compensation range adjustment feature which can be adjusted from 100 to 600 m. It has a heavy free-floating barrel with polygonal rifling and an adjustable stock. The stock is of high ...

  8. ITL MARS - Wikipedia

    en.wikipedia.org/wiki/ITL_MARS

    A pair of marines scan with M16A4 rifles in Fallujah, Iraq (December 2004); the one in the foreground has an ITL MARS attached via a MIL-STD-1913 "Picatinny rail".. The ITL MARS (multi-purpose aiming reflex sight) is a gun sight that combines two sighting devices, a reflex sight and a laser sight, as well as a backup iron sight.

  9. Barrett Optical Ranging System - Wikipedia

    en.wikipedia.org/wiki/Barrett_Optical_Ranging_System

    It takes data from thousands of tables and accounts for a number of real-time external factors automatically giving the shooter the exact yardage at which a bullet will hit its target. [ 1 ] Since the BORS is mounted directly to the scope and coupled with the elevation knobs, the computer can interact with the scope by simply turning the ...