Aircraft Gun Systems

F-35 Lightning II 25mm Gun System

General Dynamics Ordnance and Tactical Systems has been awarded a system development and demonstration contract by Lockheed Martin Aeronautics Company to design, produce and integrate the gun systems for the F-35 Lightning II stealth fighter.

GD-OTS is devel­oping the GAU-22/A for the internal and external gun systems based on a derivative of its GAU-12/U 25mm Gatling gun. An internally mounted gun system will arm the F-35A Conventional Takeoff and Landing aircraft variant and a removable or “missionized” externally mounted gun system will arm the F-35B Short Takeoff and Vertical Landing and F-35C Carrier-Based aircraft variants.

Internal Gun System
The F-35A gun system will include the GAU-22/A derivative gun, a linear linkless ammunition feed system, a gun system control unit and a 4,000-pounds-per-square-inch hydraulic drive assembly.

External Gun System
The missionized gun system designed for the F-35B and F-35C will be hard-mounted to the cen­terline station of the aircraft. This gun system will include the CTOL-common GAU-22/A derivative gun, a gun system control unit and drive assembly, and a helical linear linkless ammunition feed system contained in a conformal pod.


Gun type

Four-barrel, 25mm, externally powered
Gatling gun

Weight (without ammunition)


Internal system 416 pounds (189 kg)
External system

735 pounds (334 kg)

Rate of fire

3,000 shots per minute


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

4,000 pounds (17.8 kN)

Feed system

Conventional linear linkless (CTOL), helical

Drive system Hydraulic


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