and further extended to 20 km if the radar cross section is increased to 10 square metres, though the targets could not be engaged until much closer (3 km) due to the limited range of the gun. Fire-control system The OFC-3 system is modular design that comprises a laser range finder, a color TV camera, and an IR camera, and the laser range finder can be replaced by a laser designator (for a laser beam-riding SAM), the TV camera can be replaced by a night vision camera, and the IR camera can be replaced by an ImIR, at higher cost. Development to incorporate the dual band IR, night vision camera, and the color TV camera is reportedly in progress. Type 730 CIWS is an autonomous closed-loop system and thus offers faster reaction time than the Russian AK-630. Type 730 CIWS is fully compatible with Chinese and European combat data systems such as ZKJ-1, ZKJ-4, ZKJ-4A-3, ZKJ-5, ZKJ-6, ZKJ-7, H/ZBJ-1, and Thomson-CSF TAVITAC, and can be directly integrated with these combat data systems without any modification. Armament The 30 mm Gatling gun mount designated as H/PJ-12 is extremely similar to the General Electric GAU-8/A Avenger. Although there are sources claiming that it is the Chinese version of the Russian Gryazev-Shipunov GSh-6-30 Gatling gun, this appears to be unlikely, since the Russian Gatling gun uses bleed gas actuation. H/PJ-12 is versatile in that its FCS can be either separately installed at different locations like the Soviet AK-630, or directly integrated on the gun mount. Like the American GAU-8/A Avenger, it is recommended not to fire longer than a single minute at a rate of 4,200 rounds per minute, after which the generated heat would begin melting the rifling of the barrels, shortening its useful life. Rates of fire beyond 4,200 rounds per minute increase wear. There are one (Type 730) or two (Type 730B/C, LD-2000) ammunition drums each contains 640 (Type 730) or 500 (Type 730B/C, LD-2000) rounds, and other versions of the ammunition drums have been reportedly developed. Deployment The system has been fitted on board the Type 052 (after 2011 refit), Type 052B, Type 052C, Type 052D, Type 051C destroyers, F-22P, Type 054A frigates, Parchim-I, C28A corvettes so far, and may replace some Type 76 mounts on older combatants. The Type 1130 has been deployed on aircraft carriers Liaoning and Shandong, Type 055 destroyers, Type 075 landing helicopter docks, later