The GAU-8 / A Avenger rotary cannon is known mainly for its use on the American A-10 Thunderbolt II fighter. However, this powerful weapon has also found application in several naval anti-missile systems. In addition to the relatively well-known Goalkeeper system, there were also several structures that have almost been forgotten today.
The creators of small-caliber anti-missile systems of the CIWS category have always preferred weapons firing ammunition with high ballistic performance. The KBB and KBD cannons from the Swiss company Oerlikon, using 25 x 184 mm ammunition, were among the most powerful. Despite their undeniable qualities, however, the systems that used them did not experience greater sales success.