Russia / USSR
100 mm/70 (3.9") AK-100
Updated 19 November 2008
An "Arsenal" factory design, this weapon was originally designated ZIF-91 and was ready for trials in 1973.  This is a recoil-operated automatic weapon using a water-cooled barrel.  It uses an optronic analog control system called "Lev-114" and the gun sight is called "Kondensor-214A".

The entire weapon system is designated AK-100, while the gun itself is designated A-214.
WNRussian_39-70_ak100_Kulakov_pic.jpg

100 mm/70 guns on Vitse-Admiral Kulakov (DDG-659), a Udaloy class guided missile destroyer in June 1988
Missile launchers under the bridge are for SS-N 14 anti-ship missiles
U.S. Navy Photograph No. DN-ST-88-09282
WNRussian_39-70_ak100_Vinogradov_pic.jpg

100 mm/70 guns on Admiral Vinogradov (BPK-554) in October 1992
U.S. Navy Photograph No. DN-SC-93-04774
WNRussian_39-70_ak100_Udaloy_pic.jpg

100 mm/70 gun on Udaloy class Destroyer
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Gun Characteristics
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Designation 100 mm/70 (3.9") A-214
Ship Class Used On Kirov (Admiral Ushakov), Udaloy, Bditelny and Neusrashimy Classes
Date Of Design 1967
Date In Service 1978
Gun Weight N/A
Gun Length oa 275.6 in (7.000 m)
Bore Length N/A
Rifling Length 232.28 (5.900 m)
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 50 - 60 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round 59.1 lbs. (26.8 kg) for all rounds
Projectile Types and Weights FRAG (OF-58) - 34.4 lbs. (15.6 kg)
AA (ZS-58 and ZS-58P) - 34.4 lbs. (15.6 kg)
Bursting Charge All - 3.37 lbs. (1.53 kg)
Projectile Length FRAG (OF-58) - 40.39 in (1.026 m)
AA (ZS-58) - 40.79 in (1.036 m)
AA (ZS-58P) - 40.67 in (1.033 m)
Propellant Charge N/A
Muzzle Velocity All - 2,887 fps (880 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun Neusrashimy:  350 rounds
Others:  N/A
Note:  ZS-58 round uses a mechanical time fuze while the ZS-58P uses a radio proximity fuze.
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Range
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Elevation With 34 lbs. (15.6 kg) FRAG (OF-58) Shell
Max Ballistic Range 22,970 yards (21,000 m)
Elevation With 34 lbs. (15.6 kg) AA (ZS-58P) Shell
Max Range Against ASuW Missiles 5,470 yards (5,000 m)
Max Range Against Aircraft 10,940 yards (10,000 m)
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Mount / Turret Data
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Designation Single Automatic Turreted Mount AK-100
Weight 34.94 tons (35.5 mt)
Elevation -10 / +85 degrees
Rate of Elevation 30 degrees per second
Train 360 degrees
Rate of Train 35 degrees per second
Gun Recoil 20 in (51 cm)
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Data from
"Jane's Ammunition Handbook:  Ninth Edition 2000-2001" edited by Terry J. Gander and Charles Q. Cutshaw
"Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) by A.V. Shirokorad
"Slava, Udaloy and Sovremenniy" by Steven J. Zaloga
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Special help from Vladimir Yakubov