U.S. Marines with Marine Corps Special Operations Command (MARSOC) fire a GAU-17/A mini-gun during a live fire training exercise at Camp Lejeune, N.C., on June 6, 2017. Marines MARSOC worked with 2nd LAAD to conduct live fire exercises to maintain proficiency and accuracy with various weapon systems.
U.S. Marine Corps Photo by Lance Cpl. Cody J. Ohira
See the GAU-17/A mini-gun in action in the video below: