What is the primary weapon used by infantry Marines?

The primary weapon used by infantry Marines is the M16A4 Service Rifle. This weapon is chambered for the 5.56x45mm NATO cartridge and features a more versatile rail system for attaching various accessories such as optics, lights, and forward grips. The M16A4 has a reputation for accuracy, reliability, and low recoil, making it suitable for various combat situations.

The designation of the M16A4 reflects advancements over previous models, and it has been the standard issue for many infantry units within the Marine Corps. Its combination of lightweight design and effective range allows infantry Marines to engage effectively with enemy targets at both short and longer distances.

While the M4 Carbine is also widely used by the Marine Corps, particularly in specialized roles or by specific units, the M16A4 remains standard across the infantry as the primary weapon due to its overall capabilities and the training Marines receive on it. The M240B Machine Gun, while crucial for providing suppressive fire and support, does not serve as a primary weapon for individual infantrymen but rather as a crew-served weapon. The M16A2 Assault Rifle is an earlier version of the M16 series and has largely been phased out in favor of the M16A4