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The AR-15 rifle has a 500 mm (19.75 inches) sight radius. The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. The front sight is a post adjustable for elevation.
Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [84] Military development of compact military AR-15 carbines encouraged production of a 16-inch (41 cm) barreled civilian SP1 carbine with a collapsible buttstock beginning in 1977.
Civilian AR-15 target sights have an aperture between 1 and 1.15 mm (0.039 and 0.045 in). The aperture on AR-15 military sights have a day aperture of approximately 1.78 mm (0.070 in), and the M16A2 also a night setting with a larger 5.08 mm (0.200 in), and as such the military sight is not strictly a diopter sight in either setting.
In May 2008, Smith & Wesson introduced their first AR-15 style rifle in a new caliber, the model M&P15R, a standard AR platform rifle chambered for the Russian 5.45×39mm cartridge. [11] This was due to the availability cheap surplus Communist Bloc 5.45mm ammunition and AK-series weapons. [11]
The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.
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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]
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