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Prototype 20.3cm (No.4) Twin Gun Mount

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No.520 試製20.3cm(4号)連装砲
RedGunMedium.png Medium Caliber Main Gun
Effects: Firepower+11 AA+4 Armor+1 Accuracy+2 RangeMedium
Scrap value: Ammo 4 Steel 6 Bauxite 10 (Unbuildable)

Equipment Card Prototype 20.3cm (No.4) Twin Gun Mount.png

Equipment Character Prototype 20.3cm (No.4) Twin Gun Mount.png

Equipment Item Prototype 20.3cm (No.4) Twin Gun Mount.png

Equipment Full Prototype 20.3cm (No.4) Twin Gun Mount.png

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

Introduction

我が国の重巡洋艦用主砲20.3cm連装砲、その3号砲のif改良型です。
55口径の同重巡用主砲をさらに熟成、改良型の6m測距儀と射撃速度の向上、装弾構造の改良と誘爆防止、さらに水上電探との連携にも考慮した日本重巡のif後期型主砲兵装です。

This is an improved version of No.3 Japan's 20.3 cm main gun for heavy cruisers.
It is a what if version of the 55 caliber heavy cruiser main gun that has been further matured, with an improved 6 m rangefinder, an increased firing speed, an improved ammunition structure and explosion prevention, and further ameliorations given to cooperate with radars.

Mechanics

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).

Notes

How To Obtain

Upgradeable from: 20.3cm (No.3) Twin Gun Mount20.3cm (No.3) Twin Gun Mount

From limited-time quest: 2411 F2 (★+2)

From quest: B196 (★+2, choice)

Updates History

  • 2024-01-25: Implemented

Fit Bonuses

Prototype 20.3cm (No.4) Twin Gun Mount Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
All Furutaka-classFurutaka
Kako
All Aoba-classAoba
Kinugasa
All Myoukou-classMyoukou
Nachi
Ashigara
Haguro
All Takao-classTakao
Atago
Maya
Choukai
All Mogami-classMogami
Mikuma
Suzuya
Kumano
All Tone-classTone
Chikuma 		+ 12.7cm Twin High-angle Gun Mount12.7cm Twin High-angle Gun Mount OR 8cm High-angle Gun8cm High-angle Gun OR 10cm Twin High-angle Gun Mount (Carriage)10cm Twin High-angle Gun Mount (Carriage) OR 12.7cm High-angle Gun + Anti-Aircraft Fire Director12.7cm High-angle Gun + Anti-Aircraft Fire Director OR 8cm High-angle Gun Kai + Additional Machine Guns8cm High-angle Gun Kai + Additional Machine Guns OR 10cm Twin High-angle Gun Mount Kai + Additional Machine Guns10cm Twin High-angle Gun Mount Kai + Additional Machine Guns OR 10cm Twin High-angle Gun Mount Battery Concentrated Deployment10cm Twin High-angle Gun Mount Battery Concentrated Deployment +1 +4 +1 +4 One-time
Mikuma Kai Ni TokuMikuma Kai Ni Toku (★0-6) +5 +1 +3 +1
(★7-9) +6 +1 +3 +1
(★MAX) +6 +1 +4 +1
(2nd equipped) +2 One-time
(3rd equipped) +2 One-time
+ Surface Radar +4 +2 +3 +3 One-time
+ Type 21 Air RadarType 21 Air Radar OR Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +1 +3 +1 +2 One-time
+ Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +2 +3 +1 +2 One-time
Mikuma Kai NiMikuma Kai Ni (★0-6) +5 +2 +1
(★7-9) +6 +2 +1
(★MAX) +6 +3 +1
(2nd equipped) +2 One-time
(3rd equipped) +2 One-time
+ Surface Radar +4 +2 +3 +3 One-time
+ Type 21 Air RadarType 21 Air Radar OR Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +1 +3 +1 +2 One-time
+ Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +2 +3 +1 +2 One-time
Mogami Kai Ni /TokuMogami Kai Ni
Mogami Kai Ni Toku
Suzuya Kai NiSuzuya Kai Ni
Kumano Kai NiKumano Kai Ni 		(★0-6) +4 +1 +1
(★7-9) +5 +1 +1
(★MAX) +5 +2 +1
(2nd equipped) +2 One-time
(3rd equipped) +2 One-time
+ Surface Radar +4 +2 +3 +3 One-time
+ Type 21 Air RadarType 21 Air Radar OR Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +1 +3 +1 +2 One-time
+ Type 21 Air Radar Kai 2Type 21 Air Radar Kai 2 +2 +3 +1 +2 One-time
Myoukou Kai /NiMyoukou Kai
Myoukou Kai Ni
Takao KaiTakao Kai
Other Mogami-classMogami
Mikuma
Suzuya
Kumano
Tone-classTone
Chikuma 		- +3 +1 +1
(2nd equipped) +2 One-time
(3rd equipped) +2 One-time
+ Surface Radar +3 +2 +1 +2 One-time
Other Myoukou-classMyoukou
Nachi
Ashigara
Haguro
Other Takao-classTakao
Atago
Maya
Choukai 		- +2 +1
+ Surface Radar +3 +2 +1 +2 One-time
Furutaka-classFurutaka
Kako
Aoba-classAoba
Kinugasa 		- +1
+ Surface Radar +2 +2 +1 +1 One-time

Improvement

RedGunMedium.png Prototype 20.3cm (No.4) Twin Gun Mount

Improvement Not
Upgradable
★ Improvement
Level 		0~5 6~9
Development material Consumed 7/8 9/14
Improvement material Consumed 4/4 6/7
Equipment
Consumed 		Equipment Card 20.3cm Twin Gun Mount.pngx4 Equipment Card 20.3cm Twin Gun Mount.pngx8
Items
Consumed 		-
Resources Fuel20 Ammunition140 Steel190 Bauxite40
Ship Helper Conversion
Ship Banner Mikuma Kai Ni.png
Mikuma Kai Ni/Toku
 -
Mon Tue Wed Thu Fri Sat Sun
Improvement Improved effects
Medium Caliber Main Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Night Battle Power 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Day 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Night 1.30 1.84 2.25 2.60 2.91 3.18 3.44 3.68 3.90 4.11

See Also

v · e
Equipment List
Gallery • By Stats • Equipment Types & Icons • Development • Improvement
 
Main Guns
Foreign
10cm Twin HA Gun Mount (+ AAFD • Kai + AAFD Kai) • 12cm Single HA Gun Mount (Model E • Model E Kai) • 12.7cm HA Gun Mount (Single LM • Twin LM • Single Kai 2 • Twin Kai 2) • 12.7cm Twin HA Gun Mount (Model A Kai 3 + AAFD • Model B Kai 4 + AAFD)
Foreign
14 cm
15-15.5 cm/6 inch
20-20.3 cm/8 inch
30.5-32 cm
305mm/46 Gun Mount (Twin • Triple) (Ita) • 320mm/44 Gun Mount (Twin • Triple) (Ita) • 30.5cm Triple Gun Mount (Kai) (Sov)
35.6 cm/14 inch
38-38.1 cm
41 cm/16 inch
41cm Twin Gun Mount (Kai 2) • 41cm Triple Gun Mount (Proto • Kai • Kai 2) • 16inch Twin Gun Mount (Mk.I • Mk.V • Mk.VIII Kai) (US) • 16inch Triple Gun Mount (Mk.6 • Mk.6 + GFCS • Mk.6 mod.2 • Mk.7 • Mk.7 + GFCS) (US) • 16inch Triple Gun Mount (Mk.I • Mk.I + AFCT Kai • Mk.I Kai + FCR Type 284) (UK)
46 cm
 
Secondary Guns
Surface
Foreign
 
Anti-Air
 
Torpedo Weapons
53cm Twin Torpedo Mount • 53cm Bow O2 Torpedoes • 61cm Torpedo Mount (Triple • Triple O2 • Triple O2 LM • Quad • Quad O2 • Quad O2 LM • Quintuple O2 • Proto Sext O2) • 533mm Quint Torpedo Mount (Initial Model • Late Model) (US) • 533mm Triple Torpedo Mount (Model 53-39) (Sov)
Late Model Bow Torpedo Mount (4 tubes) (+ Skilled Sonar Personnel) • Late Model Bow Torpedo Mount (6 tubes) (+ Skilled Sonar Personnel) • Submarine 53cm Bow Torpedo Mount (8 tubes) (Late Model) • Prototype FaT Type 95 Oxygen Torpedo Kai (IJN/Ger) • 21inch 4-tube Bow Torpedo Launcher (Initial Model • Late Model) (US) • 21inch 6-tube Bow Torpedo Launcher (Initial Model • Late Model) (US) • Submarine 4-tube Stern Torpedo Launcher (Initial Model • Late Model) (US)
Kouhyouteki (Type A • Type C • Type D Kai)
 
Carrier-Based Planes
Other (IJN)
Type 96 (Kai) • Shiden (Kai 2 • Kai 4) • Reppuu (Prototype LM • Model 11 • 601 • Kai • Kai 2 • Kai 2 (CD1/Skilled)) • Prototype Jinpuu • Shinden Kai
Foreign
Bf 109 T Kai (IJN/Ger) • Fw190 (T Kai • A-5 Kai (Skilled)) (IJN/Ger) • Reggiane (2001 OR Kai • 2005 Kai) (IJN/Ita) • Wildcat (F4F-3 • F4F-4) (US) • Hellcat (F6F-3 • F6F-5) (US) • XF5U (US) • FR-1 Fireball (US) • Fulmar (UK) • Seafire Mk.III Kai (UK) • Corsair Mk.II (Ace) (UK/US)
Reppuu Kai 2 Model E (CD1/Skilled) • Hellcat (F6F-3N • F6F-5N) (US) • F4U-2 Night Corsair (US)
Foreign
Ju.87C (Kai • Kai 2 KMX • Kai 2 KMX/Skilled) (IJN/Ger) • Re.2001 CB Kai (IJN/Ita) • SBD (Yellow Wings • VB-2 Bomber Squad) (US) • SBD-5 (US) • Helldiver (SB2C-3 • SB2C-5) (US) • Corsair (F4U-1D (US) • F4U-4 (US) • AU-1 (US) • F4U-7 (Fr/US)) • FM-2 (US) • Skua (UK)
Type 97 (Skilled • 931 • 931/Skilled • Tomonaga • Murata) • Tenzan (601 • 931 • Model 12A • Tomonaga • Murata) • Ryuusei (Kai • Kai Skilled • 601 • CD1 • CD1/Skilled)
Foreign
Re.2001 G Kai (IJN/Ita) • TBD (Yellow Wings) (US) • TBF (US) • Swordfish (Mk.II Skilled • Mk.III Skilled) (UK) • Barracuda (Mk.II • Mk.III) (UK) • Mosquito TR Mk.33 (UK)
Type 97 Model E (Skilled) • Tenzan Model 12A Kai (Skilled  • Murata) • TBM-3D (US) • TBM-3W+3S (JMSDF/US)
 
Land-Based Planes
Toukai (Proto • 901)
"Army"
Type 1 Fighter Hayabusa (Model II • Model II (64) • Model IIIA • Model IIIA (54)) (IJA) • Type 3 Fighter Hien (Model 1D • 244) (IJA) • Type 4 Fighter Hayate (IJA) • Type 2 Two-seat Fighter Toryuu (Model C) (IJA) • Ki-96 (IJA) • Fw 190 D-9 (Ger) • Spitfire (Mk.I • Mk.V • Mk.IX Skilled) (UK)
"Navy"
Raiden • Shiden (Model 11 • Kai • Kai 343/301 • Kai 343/407 • Kai 343/701) • Type 0 Fighter (Model 22 (251) • Model 21 (Tainan) • Model 32 (Tainan)) • Reppuu Kai (352/Skilled)
Jets
Canard
HA
Me 163B (Ger) • Shuusui (Proto)
 
Seaplanes
Type 98 Reconnaissance Seaplane (Night Recon) • Type 0 Reconnaissance Seaplane (11B Kai Night Recon • 11A Kai 2)  • Loire 130M (Kai Skilled) (Fr) • Walrus (UK) • Sea Otter (UK)
Zuiun (631 • 634 • 634/Skilled • Model 12 • Model 12 (634) • Kai 2 (634) • Kai 2 (634/Skilled)) • Seiran (Prototype • 631) • Swordfish (Mk.III Kai • Mk.III Kai Skilled) (UK/Swe) • Laté 298B (Fr)
Type 2 Kai (Skilled) • Kyoufuu (Kai • Kai 2) • Ro.44 Seaplane Fighter (bis) (Ita)
 
Radars
 
Anti-Submarine Warfare
Ka Type Observation Autogyro (IJA) • O Type Observation Autogyro (Kai • Kai 2) (IJA) • S-51J (Kai) (JMSDF/US)
 
Miscellaneous
Night Battle Aid
Facility & Crew
Consumables
Others
Unreleased & removed
HA - High-Angle or High-Altitude; DP - Dual-Purpose; LM - Late Model; CD - Concentrated Deployment or Carrier Division
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