The AR15 Rifle was designed by Eugene Stoner and his team of engineers in the 1960’s for entry into U.S. military trials for a new battle rifle to replace the M-14. Mr. Stoner, working at the time for ArmaLite (a division of the Fairchild Aircraft & Engine Corporation), engineered a revolutionary new rifle utilizing non-traditional rifle materials such as aluminum alloys and plastics. It was initially designed around the .222 Remington cartridge. It was later, at the request of the Army, re-chambered in .223 Remington (5.56x45mm) which propelled a 55-grain bullet out of the AR-5 at roughly 3000 ft.-plus per second. With the .223-calibered AR15 rifle, for the same weight, a soldier could carry more ammunition than the older .308 Win (7.62x51mm) ammunition for the heavier M-14 rifle.