Each bullet had the length of a pint bottle. By 1974, the GAU-8 Avenger was ready for testing. The seven-barrel, gatling-style gun fired from as high as 25,000 feet and as low as 100 feet.

In our latest installment of 'TWZ TV,' we take a look back at the A-10 Warthog's defining weapon, the 30mm GAU-8A Avenger cannon. Early on it wasn't all roses for the Warthog's iconic big gun, far ...

You can plainly see how the massive, 4,000 pound (including ammo), almost 20-foot long GAU-8 Avenger dwarfs the classic VW bug next to it. The firepower of that gun has become the stuff of legend ...