Advanced Combat Optical Gunsights (abbreviated
ACOG) are a series of
telescopic sights manufactured by
Trijicon. The ACOG is designed to be used on the
M16 rifle and
M4 carbine, but Trijicon has developed ACOG accessories for certain other firearms. Models provide fixed power
magnification levels from 1.5x to 6x.
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The ACOG is available in a variety of configurations from the manufacturer with different
reticles, illumination, and other features. The TA01NSN features 4x
magnification and a crosshair reticle with a
bullet drop compensator that allows the operator to engage targets out to 600 m (2,000 ft) without adjustments. Its reticle glows
amber in darkness. It also incorporates rudimentary
ghost ring iron sights as a backup for targets that are within 50 m (160 ft), but it is only usable when mounted on the carrying handle. The TA31RCO has 4x magnification, no iron sights, and uses a
red chevron reticle which automatically adjusts to the ambient light conditions and has a bullet drop compensator that allows engagements at up to 800 m (2,600 ft). The M150 adds flip caps and is
waterproof up to 11 m (36 ft). All ACOGs do not use batteries and are designed to be usable in any lighting. Features on other ACOGs include Docter
reflex sights mounted on top,
Picatinny rails, and mounted Trijicon red dot sights.
Although the ACOG is designed for the
Picatinny rail of the
M16A4 and
M4, it can be mounted on the carrying handles of previous models.