United Kingdom: British Army and the Royal Marines.Starting in late 2009, Trijicon began shipping sights to the U.S. Trijicon has been the subject of some criticism for inscribing a reference to a Bible verse ( JN8:12, referring to John 8:12, "I am the Light of the World") alongside the model numbers on their ACOG sights. Main article: Trijicon biblical verses controversy Only certain models of the ACOG are designed with bright enough daylight-lit fiber optic or battery-powered LED reticles that facilitate this technique. This overcomes the problem of centering or acquiring fast traversing targets common with all telescopic sights. An added part of the technique is to shift focus after acquisition to the dominant eye/telescopic image for more accurate shooting. In this both-eyes-open technique the brain superimposes the aiming reticle on the target. As in any other collimator sight, the user does not actually look through the sight but instead keeps the collimated (infinity) image of the illuminated part of the reticle in focus with the dominant eye while the other eye views the entire field of view to acquire the target. The technique is essentially using the illuminated part of the reticle and its focusing rear eyepiece as a collimator sight. Several ACOG models are designed to be used with the " Bindon Aiming Concept", an aiming technique developed by Trijicon founder and optical designer Glyn Bindon. Trijicon later produced ACOG mounts and adapters for weapons besides the M16, including the Beretta AR70/90 series SIG SG 550, Heckler & Koch HK416, Bushmaster ACR, Enfield L85A2, and FN SCAR weapon systems and the Steyr AUG. Īlthough the ACOG is designed for the Picatinny rail of the M16A4 and M4, it can be mounted on the carrying handles of previous models by using a special adapter. Other features include Picatinny rails, flip caps, and the ability to be waterproof up to 11 m (36 ft). The ACOG ECOS line features both of these secondary sighting systems on the same scope. Others include Docter or Trijicon reflex sights mounted on top. Most ACOG models, when mounted to a carry handle, have an open space through the mount to allow the use of the rifle's iron sights without removing the scope. Some ACOG models incorporate rudimentary ghost ring iron sights as a backup for targets that are within 50 m (55 yd). Reticles have other features such as a bullet drop compensator and other different reticle shapes such as chevrons. Normally this allows the brightness of the reticle to match the field of view since it collects ambient light from around the sight, although this can lead to a mismatch in lighting - such as sunlight hitting the light pipe directly, or standing in a shadow - causing the reticle to be much brighter or darker than the target. Some versions of the ACOG have an additional daytime reticle illumination via a passive external fiber optic light pipe. The tritium illumination has a usable life of 10–15 years. Most ACOGs do not use batteries for reticle illumination, being designed to use internal phosphor illumination provided by the radioactive decay of tritium. The ACOG is available in a variety of configurations from the manufacturer with different reticles, illumination, and other features. Between 20, the ACOG was selected as the official Rifle Combat Optic of the United States Marine Corps, prompting Trijicon to produce 100,000 units for the US Marines in the following 18 months. In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. The first ACOG model, known as the TA01, was released in 1987.
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