The M16's adaptability and performance have made ... the rifle’s direct impingement operating system is very reliable. Lastly, the 5.56 cartridge is quite lethal but is also lightweight, which ...
In December of the same year a configuration for the Soviet cartridge 7.62x39 was finalized. The AR-15 was created in the late 1950s. In 1962, the rifle was authorized for military use as M16 and ...