After successfully evolving from the XM16E1, the Colt M16A1 rifle, adopted during 1967, continued in service until 1983. Despite the rifle's problematic beginning during the Vietnam War, it evolved into a world-class military weapon, and its 5.56mm cartridge has become the NATO standard. The origins of the M16A2 rifle began with a request from the U.S. Marine Corps, who pride themselves on marksmanship and a tradition of "Every Marine a Rifleman." During September of 1979, Marine Corps representatives met with Colt to discuss their ideas on how to improve the M16A1 rifle. They wanted a rear sight adjustable out to a range of 800 meters, a more accurate cartridge, and one that could penetrate military helmets and body armor at 800 meters. The Marines wanted a 3-round burst feature in place of the full-automatic function. During training, the Marines were hard on their weapons, particularly during bayonet drills. In order to have their rifles stand up to rough use, they requested a heavier barrel, and more durable plastic stocks and forearms.
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