While the A-10 has a lot of room on its wings to carry bombs and missiles, its main weapon is the gun, called the GAU-8 Avenger. It is a very long and heavy gun called a Gatling cannon, since it is a both an autocannon (fires large bullets very fast) and Gatling gun (has more than one barrel, which spin while being shot) The Avenger is so big that the A-10 had to be built around it, which created the joke that the A-10 does not have a gun attached like other warplanes, but it is the Avenger that has a plane attached. The A-10 is the only airplane to use the Avenger, other American planes instead use the smaller Vulcan, which is also a Gatling cannon but with a smaller bullet.