F-35 Fighter Jet Blasts Through 1st-Ever Airborne Gun Test

A four-barrel machine gun blasts a spray of rounds into midair. It was the first of a series of trials meant to test the functionality of the jet's internal 25-millimeter machine gun, according to Lockheed Martin, the defense contractor that developed the fighter jet. The plane is equipped with a four-barrel machine gun, which remains hidden under a trap door in the left wing of the plane, near the cockpit, until it's time to fire.