Oerlikon KCB
The Oerlikon KCB is a 30 mm caliber autocannon, originally developed by Hispano-Suiza as the HS.831A. When Oerlikon purchased Hispano's armaments division in 1971, the HS.831L became the Oerlikon KCB. == Development == The HS.831A is a post-war development of the HS.830 developed in 1944, which is a scaled-up version of the 20 mm HS.820 and has much the same general operating principles. Originally, the 30×170mm brass case round was developed, it was later changed to a steel case round.