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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.
Unertl Optical Company, Inc. was a manufacturer of telescopic sights in the United States from 1928 until 2008. They are known for their 10× fixed-power scopes that were used on the Marine Corps' M40 rifle and made famous by Marine Corps Scout Sniper Carlos Hathcock during the Vietnam War.
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]
The M24 Sniper Weapon System (SWS) or M24 is the military and police version of the Remington Model 700 rifle, M24 being the model name assigned by the United States Army after adoption as their standard sniper rifle in 1988.
The A2 series is the optics mid life upgrade for the C7A2 program as the tritium needs to be replaced every 8 to 12 years of service."C79A2" is engraved on the left side of the optic mounting base. This model is used on C7A2 rifles and C8A3 carbines. The United States also uses this optic on some of its M4 Carbines.
Major precision rifle variants used by snipers from around the world are as follows. The list includes hunting or precision rifles equipped with a telescopic optic, and precision rifles used by both military and law enforcement trained snipers and marksmen.
IOR optics are currently imported into the US by Valdada Optics and are marketed as "IOR-Valdada". IOR's LPS 4x6° TIP2 scopes are commonly found on Eastern Bloc sniper rifles such as the Puşca Semiautomată cu Lunetă, and SVD Dragunov. It is also a very common optic on the US commercial market on rifles that feature a compatible side rail mount.
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 ...