You know, you really need to check your FACTS before blasting away e-mails and 'phone calls to people telling them they are idiots, and that the AR15 was never used by any army, anywhere.
Read and learn (then maybe send some apologetic emails to those that you have misinformed, and given yet more reason not to believe anything that comes from the pro-gun lobby):
Based on the AR-10, Army officials asked ArmaLite to develop a smaller version of the AR-10 in 1956. The ensuing rifle was called the AR-15. Army analysis of battlefield statistics from WWI, WWII and Korea, had shown that most kills from small arms occured at ranges of less than 300 yards. This suggested that the military should seriously consider lighter weight, higher capacity weapons. Seeking a novel cartridge suitable for a smaller caliber assault rifle, Eugene Stoner approached Winchester Corporation. The result was the small but powerful .223 Rifle Cartrdige -- high-velocity, light weight, low recoil, and capable of penetrating a helmet per US Army specifications.
Production of the AR-15 rifle was licensed to to Colt Manufacturing Company in 1959. Early Colt AR-15s, their magazines, and their operators manuals were marked with ArmaLite's name. Colt's retained the AR-15 designation on commercial rifles. To this day Colt's has a model designation with the letters AR, which stands for "ArmaLite".
The AR-15 was selectable for full and automatic fire. The AR-15 was to have had the same effective range as the M14 rifle, but it was most effective at a range of 215 yards (200m) or less. The M16 used a 5.56mm (.223 cal.) cartridge in 20- or 30-round magazines. To compensate for the reduced size of the 5.56 mm bullet, the AR-15 designers increased the velocity of the bullet so that it would have an adequate range and the flat trajectory needed for accurate aiming. The M16 bullet had a muzzle velocity (velocity on leaving the gun) of 980 meters per second as compared to 870 meters per second for the M14 rifle and 720 metres per second for the Soviet AK-47 7.62 mm rifle, while at a range of 100 meters the velocities of the three bullets were 830, 800, and 630 meters per second respectively.
The U.S. Air Force completed tests of the AR-15 in January 1961. The Air Force procured 8,500 rifles in 1961 and standardized the AR-15 in 1963. The weapon was first deployed to the Air Force's Air Police. The original AR-15 was designated the M16 in 1962.
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This text was lifted from
the website which is reasonably authoratative on its subject matter.
If you don't care to believe it, you can do some more research yourselves.