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Prototype 51cm Twin Gun Mount

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Prototype 51cm Twin Gun Mount

No.128 試製51cm連装砲

Large Caliber Main Gun Large Caliber Main Gun

Effects: Firepower+30 Evasion-1 Anti-Air+5 Accuracy+1 Range Very Long

Scrap Value: Ammunition30 Steel28

Equipment Card Prototype 51cm Twin Gun Mount.png

Equipment Character Prototype 51cm Twin Gun Mount.png

Equipment Item Prototype 51cm Twin Gun Mount.png

Equipment Full Prototype 51cm Twin Gun Mount.png

Refittable Class
Coastal Defense ShipDestroyer
Light CruiserTorpedo Cruiser
Heavy CruiserAviation Cruiser
BattleshipAviation Battleship
Fast BattleshipLight Carrier
Standard CarrierArmored Carrier
Seaplane TenderSubmarine Tender
SubmarineSubmarine Carrier
Repair ShipTraining Cruiser
Fleet OilerAmphibious Assault Ship



"Yamato" kai type, the development of a Super Yamato class main gun have been developed as one of the largest caliber gun ever to be fitted on a warship.

The 51cm guns achieved a firepower that overwhelmed the firepower of the other battleship's main guns. As the gun surpasses even the weight and size of the 46cm guns, only limited battleships are able to equip this gun.


How To Obtain

Stock equipment of Musashi Kai NiMusashi Kai Ni

Upgradeable from 46cm Triple Gun Mount Kai46cm Triple Gun Mount Kai

Event reward for:

Ranking reward for:

  • Jun 2015: 1-5 (x2), 6-20
  • Jul 2015: 1-5, 6-20
  • Sep 2015: 1-5, 6-20, 21-100
  • Oct 2015: 1-5
  • Nov 2015: 1-5, 6-20, 21-100
  • Jan 2016: 1-5, 6-20
  • May 2016: 1-5, 6-20
  • Jun 2016: 1-5, 6-20
  • Nov 2016: 1-5, 6-20

Updates History

  • 2015-02-06: Implemented
  • 2015-05-18: Became improvable
  • 2021-06-22: Became upgradeable to 51cm Twin Gun Mount51cm Twin Gun Mount

Akashi's Improvement Arsenal

Type Name Resource Day 2nd Ship Note
Fuel Ammunition Steel Bauxite Item Icon Development Material.png Item Icon Improvement Material.png # of equipment needed for that upgrade. An asterisk following the number indicates a different equipment is required. Sun Mon Tue Wed Thu Fri Sat
Large Caliber Main Gun Prototype 51cm Twin Gun Mount 0 50 550 950 80 7/9 5/7 2xRedGunHeavy.png X Y
X X X Yamato Kai
Musashi Kai
Musashi Kai Ni can NOT improve this equipment.
6 10/15 7/10 3xRedGunHeavy.png
10 - - -

See also

51 cm/45 (20.1") "A" Type 98 (?)