On June 9th a F-35 successfully tested its on-board four-barrel GAU-22/A Gatling gun for the first time. This would be a great selection to either shoot air-to-ground or air-to-air to target enemies in combat. Apparently it can fire an incredible 55 rounds per second, but with only having a 220-round magazine on board it could be empty within 4 seconds…. Watch the video in HD and leave your thoughts in a comment below.