| Oerlikon KCB | |
|---|---|
 HS.661 | |
| Type | Autocannon |
| Specifications | |
| Mass | 138 kg |
| Barrel length | 75 caliber |
| Cartridge | 30×170mm |
| Calibre | 30mm |
| Barrels | 1 |
| Action | Gas-operated |
| Rate of fire | 600 round/min |
| Muzzle velocity | 1,080 m/s (3,500 ft/s) |
| Effective firing range | 3,000 m |
The KCB is a 30 mm caliber autocannon, developed by Hispano-Suiza as HS.831. [1] When Oerlikon purchased Hispano's armaments division, the gun became KCB. [1]
HS.831 is a scaled-up version of the 20 mm HS.820 and has much the same general operating principles. [1] It uses the 30x170mm round that was developed for this gun. [2] On ground, the HS.820 was used in combination with the HS.661, a single simple anti-aircraft gun mount, [3] and was also mounted on the AMX-13 DCA (Défense Contre Avions), a self-propelled anti-aircraft weapon for the French Army. [4]
In the United Kingdom, BMARC developed A32, a locally operated naval mounting incorporating two HS.831. [1] When the gun was renamed KCB, the A32 became GCM-A series. [1] And LSE (Laurence, Scott & Electricmotors Ltd; presently MSI Defence Systems) also developed a single mount for KCB, which became DS30B . [1] Both GCM-A and DS30B were introduced by the Royal Navy. [1]
The United States Navy designated the twin HS.831 weapons system developed by Emerson Electric as EX-74. [5] This mount was commercialized as the Emerlec 30 and appreciated by foreign navies. [5]
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