F-35A Completes First Aerial Gun Test. br F-35A Completes First Aerial Gun Test. November 02, 2015. The F-35A Lightning II completed the first three airborne gunfire bursts from its internal Gun. For the first time, an Air Force F-35 fighter jet has successfully fired its internal gun from the air. First F-35 Aerial Gun Firing. This F-35A, AF-2, completed the first three airborne gunfire bursts from its internal four-barrel 25mm Gatling gun system embedded in the left.