What It’s Like To Stand 5 Feet Behind A GAU-8 During Live Testing MHPosted onFebruary 20, 2017April 13, 2019 A-10 Thunderbolt/GAU-8 Avenger Gun Firing from 5 feet behind, 30mm, 142 Rounds in 3 Seconds. Nothing but that deep, echoing “brrrrrrrrrrrt”!