Which of the following is true about the M4A1?

The M4A1 is an important firearm in military operations and is distinct for its capability to operate in both semi-automatic and fully automatic modes. This versatility allows the user to select the firing mode based on the situation, making it adaptable for various tactical scenarios. In semi-automatic mode, each pull of the trigger results in one shot, while in fully automatic mode, the weapon continues to fire as long as the trigger is held down.

The design of the M4A1 supports effective handling and engaged firing, making it suitable for a range of applications in combat situations. Its capability for selective fire is one of the key features that differentiates it from other firearms, such as single-shot weapons or shotguns, which operate under more limited functionality. Furthermore, the M4A1 is specifically designed to be fired from a shoulder position, enhancing accuracy and control during use. This design factor reinforces its effectiveness as a standard-issue weapon within many armed forces.