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The M16 multiple gun motor carriage, also known as the M16 half-track, was an American self-propelled anti-aircraft weapon built during World War II.It was equipped with four .50 caliber (12.7 mm) M2 Browning machine guns in an M45 Quadmount. 2700 were produced by White Motor Company from May 1943 to March 1944, with 568 M13 MGMCs and 109 T10 half-tracks being converted into M16s as well.
The 5.56 mm round had to penetrate a standard U.S. helmet at 500 yards (460 meters) and retain a velocity over the speed of sound while matching or exceeding the wounding ability of the .30 carbine cartridge. [50] This request ultimately resulted in the development of a scaled-down version of the Armalite AR-10, named the ArmaLite AR-15. [51]
A1: "Field sights" in which the rear sight is only adjustable for windage; A2: Rear sight adjustable for both windage and elevation; Flattop: Indicates carry handle and rear sight has been replaced with a MIL-STD-1913 rail. A detachable carry handle can be attached to the rail which features either A1 (Diemaco/Colt Canada) or A2 (Colt) sights
The M16K is a so-called "K" weapon ("K" standing for the German word Kurz meaning short). The La France M16K was basically a standard military M16 rifle chambered for the 5.56 mm cartridge, but modified with an 8 + 3 ⁄ 8 inches (210 mm) barrel.
The M16 has a 50.8 cm (20.0 in) barrel and a 500mm (19.75 inches) sight radius. [18] The M16 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters, and 300 to 400 meters. [ 13 ]
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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]
Military M1917 ladder aperture sight calibrated out to 1,600 yd (1,463 m) Aperture sights on military rifles use a larger aperture with a thinner ring, and generally a simple post front sight. Rifles from the late 19th century often featured one of two types of aperture sight called a "tang sight" or a "ladder sight".