M16A4

Overview: The M16A4 is a 5.56×45mm NATO, magazine-fed, selective-fire rifle and the final evolution of the M16 family adopted by the U.S. military. It features a 20-inch barrel, a flat-top upper receiver with a MIL-STD-1913 Picatinny rail, and supports the attachment of modern optics, aiming devices, and accessories. The M16A4 combines the range and accuracy of a full-length rifle with modular flexibility, making it a standard-issue weapon for many units throughout the 2000s.

Development & Background: The M16A4 was introduced in the late 1990s to early 2000s as an upgrade over the M16A2, incorporating feedback from troops engaged in increasingly urban and modular combat environments. Its flat-top receiver replaced the fixed carry handle, enabling the use of optical sights such as the ACOG, EOTech, or Aimpoint, while maintaining compatibility with iron sights via detachable carry handles. The rifle retained the three-round burst fire mode from the M16A2, rather than adopting full-auto capability like its shorter cousin, the M4A1. It was commonly paired with the M5 RAS (Rail Adapter System) handguard, allowing for the attachment of vertical grips, lights, and lasers.

Service & Usage: The M16A4 became a standard-issue rifle for the U.S. Marine Corps and select U.S. Army units during the Global War on Terror, particularly in Iraq and Afghanistan. Its long barrel and high muzzle velocity provided superior range and accuracy, making it well-suited for open terrain engagements. Marines appreciated the rifle’s performance in mid- to long-range firefights, although its length was occasionally a drawback in close quarters or mounted operations. As newer rifles like the M27 IAR began to replace it, the M16A4 remained in service for training, reserve units, and allied forces, demonstrating its enduring reliability and accuracy.

Weapon Type:	Assault Rifle
Calibre:	5.56x45mm
Length:
Barrel:
Sights:
Optics:
Rail System:
Buttstock:
Selector:
Magazine:
Muzzle Velocity:
Variants (RHS):
Factions Arsenal:	RHS USMC