The M4A1+ would also include an enhanced, single-stage trigger module "free of creep with consistent trigger pull weight within the range of 4.0 to 5.0 pounds," according to the document.

The M4/M4A1 5.56mm Carbine is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock. It is now the standard issue firearm for most ...

EXCLUSIVE: A competing rifle outperformed the Army's favored M4A1 carbine in key firings during a competition last year before the service abruptly called off the tests and stuck with its gun ...

The Army is issuing Soldiers a new small arms 5.56 ammunition magazine designed expressly for the M4/M4A1 carbine and M16 family of weapons. The 2nd Battalion, 75th Ranger Regiment from Joint Base ...

The US Army has now produced at least 117,000 battle-tested, upgraded M4A1 rifles engineered to more quickly identify, attack and destroy enemy targets with full auto-capability, consistent ...

Arguments for: Unlike the M4A1, which injects the hot, dirty gunpowder gases into the gun's action, the 416 vents the gasses outward. The result is a rifle that runs much cleaner.