The GAU-21 is a .50 calibre, single barrel, rapid-fire machine gun used on the Fleet Air Arm’s MH-60R. The GAU-21 provides both offensive and defensive firepower ranging out to nearly 2,000 meters.

An evolution of the FN M3 .50 calibre heavy machine gun, it uses an open-bolt operation and a dual recoil buffer system. Operating independent of either electrical or hydraulic power sources, the GAU-21’s unique soft mount system enhances weapon accuracy and minimizes the firing vibration transmitted to the airframe.

Specifications

  • Function: heavy machine gun
  • Manufacturer: Fabrique Nationale Herstal (FN Herstal)
  • Designed: 2004
  • Operation: short recoil
  • Modes: fully automatic
  • Feed: belt-fed
  • Rate of fire: 950–1,100 rounds per minute
  • Ammunition: ball and tracer
  • Calibre: 50 BMG (12.7 mm by 99 mm) NATO
  • Range: 2,000 m (maximum effective)

Function

Small arms