The M61A1 gun and the ammunition handling system is simultaneously driven by a hydraulic drive unit run by the aircraft’s hydraulic system. The hydraulic pressure is supplied through a hydraulic fluid manifold electrically controlled by a dual-rate solenoid valve. This solenoid valve is controlled from the cockpit through the gun control unit (GCU), which results in the gun firing at 6,000 (GUN HIGH) or 4,000 (GUN LOW) rounds per minute. 
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