Formerly known as the Hispano Suiza Type HS 831, the Oerlikon Contraves Type KCB is virtually a scaled-up version of the 20 mm Type KAD and has much the same general operating principles. The KCB-B left-hand or Type KCB-B right-hand, is a gas-operated, belt-fed, fully automatic and recoiling cannon. The belt feed mechanism is recoil-operated.

The only recent production application for the 30 mm Oerlikon Contraves 30 mm KCB cannon is for the South Korean Daewoo Flying Tiger (Biho) twin 30 mm self-propelled anti-aircraft gun system on a full tracked chassis which is now in production for the South Korean Army.

Production as required. Installed on the Oerlikon Contraves naval mount GCM family. Systems & Electronics Inc (previously Electronics & Space Corporation) twin 30 naval mount, Giat Industries AMX-30 twin SPAAG. The only user of the latter system is Saudi Arabia. Now in production for the South Korean Flying Tiger twin 30 mm self-propelled antiaircraft gun system.