Multi-barrel Weapons

GAU-12/U 25mm Gatling Gun

The 25mm GAU-12/U produced by General Dynamics Ordnance and Tactical Systems is an externally powered Gatling gun adaptable for air, land and sea platforms.
The GAU-12/U has significant muzzle energy and combat lethal­ity. These factors, when combined with a maximum firing rate of 4,200 shots per minute, provide an effective weapon for a variety of combat missions.

Each of the GAU-12/U’s five bar­rels contain its own breech bolt assembly, which fires once per gun revolution. This ensures extended barrel life by distributing firing loads over all five barrels. Continuous rotary motion reduces impact loads on gun components, providing extended parts life and high reliability.

The GAU-12/U provides air-to-air, ground-to-air and air-to-ground firepower for the U.S. Marine Corps AV-8B Harrier II aircraft, the Light Armored Vehicle - Air Defense (LAV-AD) and the U.S. Air Force AC-130U Gunship.
A derivative of the GAU-12/U known as the GAU-22/A is currently being developed for appli­cation on the U.S. Military's Joint Strike Fighter.


Gun type

Five-barrel, 25mm, externally powered Gatling gun

Weight 270 pounds (123 kg)
Rate of fire

Up to 4,200 shots per minute

Dispersion 5 milliradians diameter, 80 percent circle
Muzzle velocity

(TP, HEI ammunition) 3,560 feet (1,085m) per second
(API ammunition) 3,400 feet (1,036m) per second

Average recoil force 5,000 pounds (22 kN)
Ammunition capacity 511 rounds
Feed system Linked or linkless
Drive system Hydraulic, electric, pneumatic


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