With the high velocity flat trajectory 5.56 mm cartridge one should aim about half way between the enemy’s chin and belt to ...

223 Remington caliber M16 rifle, AKA the “Mattel ... by perceived problems for infantry usage in the jungles of Vietnam: the heavy weight and lack of controllability during full-auto fire.

Despite early controversies and setbacks in Vietnam, the M16 proved its worth. The rifle's design has evolved, leading to variants like the M4 and specialized models used by special operations forces.

"Even the noise gave them confidence - the Kalashnikov is much louder than the M16 ... and Vietnam. The weapons were often delivered to the coastlines of Honduras or Nicaragua. The guns were ...