The General Electric GAU-8/A Avenger is a 30 mm hydraulically driven seven-barrel Gatling-style autocannon that is primarily, and most famously mounted in the United States Air Force's Fairchild Republic A-10 Thunderbolt II. Designed to destroy a wide variety of ground targets, the Avenger delivers 30mm rounds at a high rate of fire. The GAU-8/A is also used in the Dutch Goalkeeper CIWS ship weapon system, which provides defense against short-range threats such as highly maneuverable missiles, aircraft, and fast-maneuvering surface vessels. The GAU-8/A was designed by General Electric and has been produced by General Dynamics since 1977. Wikipedia

The standard ammunition mixture for anti-armor use is a five-to-one mix of PGU-14/B Armor Piercing Incendiary, with a projectile weight of about 395 grams or and PGU-13/B High Explosive Incendiary (HEI) rounds, with a projectile weight of about 378 grams The PGU-14/B's projectile incorporates a lightweight aluminum body, cast around a smaller caliber depleted uranium penetrating core. In 1979, the Avenger was tested against M47 Patton tanks and caused "severe damage".

Depleted uranium is very dense; at 19,050 kg/m3, it is 1.67 times as dense as lead, only slightly less dense than tungsten and gold, and only 16% less than osmium or iridium, which are the densest known substances under standard pressures. Consequently, a DU projectile of given mass has a smaller diameter than an equivalent lead projectile with the same kinetic energy, with less aerodynamic drag and deeper penetration because of a higher pressure at point of impact. DU projectiles are inherently incendiary because they become pyrophoric upon impact with the target.