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The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]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. [6]
A magnification factor of 10, for example, produces an image as if one were 10 times closer to the object. The amount of magnification depends upon the application the telescopic sight is designed for. Lower magnifications lead to less susceptibility to shaking. A larger magnification leads to a smaller field of view.
The few scopes sold to a limited number of law enforcement agencies and even fewer civilians were marked "10x Sniper" and carried a "T" prefix on the serial numbers. Servicing of these scope were taken over by U.S. Optics who also produced their own version and used the nomenclatures MST-100 for the 7.62 scope and MST-150 for the .50 BMG Scopes.
The optic has two standard reticles: both are a cross, feature a range finder out to 600 m (656 yd) for 5.56x45 and 800 m (875 yd) for 7.62x51, where they differ is in the bulletdrop design, where the one called CX5395/CX5396 uses circles to denote the range, while the other called CX5455/CX5456 uses lines and also features lines for windage.
A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan.A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens.
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
General purpose scopes Gradations (clicks) of 1 / 4 ′, 1 / 10 mrad and 1 / 2 ′ are used in general purpose sights for hunting, target and long range shooting at varied distances. The click values are fine enough to get dialed in for most target shooting and coarse enough to keep the number of clicks down when dialing ...
The telescopic sight is factory matched to the rifle by engraving the scope's serial number on to the butt stock of the SVD rifle. Commercial Russian Tigr rifles (based on the SVD military rifle) have the serial number of the rifle engraved in to the PSO-1M2 scope's side mount.