of the high-explosive round. Ammunition is also produced in Romania and Serbia. Specifications Calibre: 30 mm Traverse: +180 to -180 degrees at 35 degree/s Elevation: -12 to +87 degrees at 50 degree/s Mounting weight: 1857 kg to 1905 kg Rate of fire: 2,000 rpm (system) Gun Weight: 343.9 lbs. (156 kg) Gun Length oa: 84.25 in (2.140 m) Bore Length: 74.69 in (1.897 m) Rifling Length: 71.06 in (1.805 m) Grooves: 12 Chamber Volume: 13.49 in3 (0.221 dm3) Rate Of Fire: over 1,000 rounds per minute cyclic Variants AK-230 A type - For ships with 220 V DC power systems. AK-230 B type - For ships with 380 V AC power systems. AK-230M - Less magnetized version for minesweepers (380 V AC). Type 69 - Chinese upgraded version, total weight 3,600 kg. Shells are ejected outside of the turret. a faster 50 degree/second traverse. References General references Jane's Naval Weapon Systems Issue Thirty Three Navy Weapons.com Naval anti-aircraft guns Autocannons of the Soviet Union Close-in weapon systems 30 mm artillery Cold War artillery of the Soviet Union Anti-aircraft guns of the Soviet Union Military equipment introduced in the 1960s