The M4-series Carbine achieves over 80% commonality with the M16A2 Rifle and replaces all M3 .45 caliber submachine guns, and selected M9 pistols and M16 rifles. The Army is pursuing a two-phase ...

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.