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Prototype 41cm Triple Gun Mount

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No.105 試製41cm三連装砲
RedGunHeavy.png Large Caliber Main Gun (41cm)
Effects: Firepower+22 AA+5 Accuracy+2 RangeLong
Scrap value: Ammo 14 Steel 22 (Unbuildable)

Equipment Card Prototype 41cm Triple Gun Mount.png

Equipment Character Prototype 41cm Triple Gun Mount.png

Equipment Item Prototype 41cm Triple Gun Mount.png

Equipment Full Prototype 41cm Triple Gun Mount.png

Refittable Class
Coastal Defense Ship Destroyer
Light Cruiser Torpedo Cruiser
Heavy Cruiser Training Cruiser
Aviation Cruiser Fast Battleship
Battleship Aviation Battleship
Light Carrier Standard Aircraft Carrier
Armored Carrier Seaplane Tender
Submarine Aircraft Carrying Submarine
Submarine Tender Fleet Oiler
Repair Ship Amphibious Assault Ship



A triple-mounted domestic battleship main gun prototyped by Kure Naval Arsenal's Artillery Division.
At a little over 16 inches (40.6cm), this 41cm gun was the largest battleship gun in the world until the introduction of the Yamato-class' 46cm guns.
When equipped on the Nagato-class battleships, they would have had firepower and accuracy far exceeding that of any Big 7 from the other great powers.


Main GunsSmall Caliber Main GunMedium Caliber Main GunLarge Caliber Main Gun are the main armament used by surface ships. Their main stats are the "firepower" Firepower and "accuracy" Accuracy. They are notably required to trigger all Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).


How To Obtain

Stock equipment of: Fusou Kai NiFusou Kai Ni, Hyuuga Kai NiHyuuga Kai Ni, Ise Kai NiIse Kai Ni, Mutsu Kai NiMutsu Kai Ni, Nagato Kai NiNagato Kai Ni, Yamashiro Kai NiYamashiro Kai Ni

Upgradeable from: 41cm Twin Gun Mount41cm Twin Gun Mount

Ranking reward for:

  • Aug 2014: 1-5
  • Sep 2014: 1-5, 6-20
  • Oct 2014: 21-100 (x2), 101-500
  • Nov 2014: 1-5, 6-20, 21-100
  • Feb 2015: 1-5, 6-20, 21-100
  • May 2015: 1-5, 6-20
  • Feb 2016: 6-20
  • Apr 2016: 1-5, 6-20
  • May 2016: 21-100, 101-500
  • Nov 2016: 21-100
  • Feb 2017: 1-5, 6-20
  • Dec 2017: 21-100

Event reward for:


Used to improve: 41cm Triple Gun Mount Kai41cm Triple Gun Mount Kai, 41cm Triple Gun Mount Kai Ni41cm Triple Gun Mount Kai Ni, 41cm Twin Gun Mount Kai Ni41cm Twin Gun Mount Kai Ni

Used by quest: F74

Updates History


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 41cm Triple Gun Mount 0 40 440 620 40 5/7 4/6 2xRedGunHeavy.png N
Nagato KaiNagato Kai
Mutsu KaiMutsu Kai
Mutsu Kai NiMutsu Kai Ni
Upgrades to 41cm Triple Gun Mount Kai41cm Triple Gun Mount Kai.
6 8/10 5/8 3xRedGunHeavy.png
10 15/30 12/16 2xRedGunHeavy.png
2xItem Icon New Model Gun Mount Improvement Material.png
Improvement Improved effects
Large Caliber Main Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.50 2.12 2.59 3.00 3.35 3.67 3.96 4.24 4.50 4.74
Night Battle Power 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16

See also