This list is focussed on small arms, so no Jap tanks or planes. As we all know the Jap TT is rather empty, this is an updated list of of suggestions for Japanese small arms that could be added to the TT, or as events rewards or premium content. I have used list created by other users (see credits bellow) combined with some of my own research.
Despite having been educated as a historian studying militairy hardware, I am by no means an expert on Japanese weapons. Nor is my research extensive in any sence. This is not meant as a end all be all factual list, some suggestions might be slightly off. Please tell me if I forgot any weapons or got something wrong so I can update the list.
Sidenote, I am not saying add literally all of these, but rather to stop adding random sawn of American weapons or German AT weapons, and instead add actual Japanese stuf (even though some of these are prototypes or very limited in quantity).
Japan made
Melee
Bamboo spear

Pole Bayonet - in picture is captured by a a United Statian Person
Especially nice if it could be combined with the Japanese headband as customisation

Bolt Action Rifle
Type 18 Murata rifle - 11mm - 1 round

Type 22 carbine (bottom) - 10.97mm - 1 round
Murata rifle Type 30 - 10.97mm - 1 round
Type 44 Carbine - 5 rounds

Type 44 carbine (engineer version) - 5 round Arisaka

Type 38 with 30 round Type 96 magazine
National Defence Rifle - Arisaka cartridge (7.7×58mm top rifle, 8mm lower two rifles)


Note that there are also also many paratrooper vesions of bolt actions rifles that could be added, such as experime TERA, foldable Type 99 Rifle, etc. However, I dont know which version is in the game so left it out.
Shotguns
Murata shotgun

Semi-auto Rifle
1932 Watanbe rifle - 8 rounds of 6.5x50SR (thanks DELAVR for the extra help on this one)

Type Ko Carbine
Type Ko (long)

Type Hei (late) long with bipod (optionally with 20 round mag)

Vinvtoka Shiro Koyaba Type 38 - is little more than a patent from my understanding, but would be an intresting event ‘what if’ weapon

Select fire rifle
Type Hei Auto 20 round version

Sniper Rifles
Type 38 rifle (Type 38 Kai) with scope with 2.5x magnification
Prototype Sniper Rifle Kokura arsenal - semi auto 10 rounds

Potentially the Type 4 scoped - (not a real picture)
Although there is no direct proof this has been done, it is possible.
Sniper 3 for Japan - Archive / Suggestions - Archive - Enlisted
For reference, here is an investigation by @_DELAVR about the potential scope for various Japanese rifles: Japanese sniper rifles - an investigation
- Mess Room - Enlisted
Type Hei Auto might have had the ability to mount a scope as well.
Sniper 3 for Japan - Archive / Suggestions - Archive - Enlisted
LMG
Prototype Type 11 Model 1 - 30 round - 500rpm

Prototype Type 11 Model 2 - 30 round - 500rpm

Prototype Type 11 Model 3 - 30 round - 500rpm
Scoped Type 91:

Scoped Type 96

Scoped Type 99

Type 99 with shield - shield seen bellow

SMG
Prototypes of the Type 100 - Model 3 - 530rpm

Prototypes of the Type 100 - Model 3A - 775rpm

Prototypes of the Type 100 - Model 3B - 755rpm

Tokyo arsenal model 1927

Assault Rifle
Nambu Model 2 Ko - Type 2 SMG is the version chambered with 6.5x30mm Arisaka

Anti-Tank
13mm Manual Gun (AT rifle) - 13.2x99mm
Prototype 9cm Rocket Launcher, 93.5mm - 120mm pen

Prototype armor-piercing bullet Type 99 rifle grenade (70mm caliber) (75mm pen)

75mm Grenade for Type 2 launcher - (100mm pen estimated)

Type 97 20mm with Ji-Te Dan - (200mm pen estimated)

Japanese Grenade Launcher 75mm (could be effective against personel as well)
Pistol
National Defence Pistol - Nambu pistol cartridge (8mm)

Type A Pistol - 8mm

Type B small

Type 25 revolver

Hino Komuro Pistol

Prototype Mark A Pistol (15 shot)

Type 4 - 20.5 mm

Type 5 - 20.5 mm
Sugiura pistol - 7.65 mm - manufactured in Manchuria

Inagaki pistol - .32 ACP

Other
Type 97 81 mm Mortar

type 95 75mm gun (engineer build)

Type 90 field gun - 75mm (engineer build)
Bouganville improvised grenade launcher Type 99
Crossbow with explosives - Japan is crazy

APC
Type 1 Ho-Ki

Type 4 Chi-So

Type 98 Ko-Hi half-track

Amphibious Su-Ki

Amphibious Ka-Tsu (Imperial Navy)

F B swamp vehicle - APC specificly made to cross swamps
Flame Tank
Sōkō Sagyō Ki (SS) engineer vehicles had a flamer version, the SS Tei Gata. The first picture is of an orginal without the flamers. The second is of the tank in action in another game as a reference for how it could look.


For potential rider II?
Type 100 Te-Re recon vehicle

A pattent described a bicycle with a slot for a rifle

Imported, licenced or copied
Bolt Action Rifle
Vz. 24 Type III MO - 5 rounds (“Mo” stand for Moseru, meaning Mauser)

Type Mo I at the top and Type Mo II at bottum for reference
Siamese Mauser style rifle - ปืน ร.ศ. 121 - Type 38 exported to Siam (Thailand). For Thai event squad?
LMG
The Type 98 Machine gun (Type 98 swivel machine gun) - MG15 copy (Initially 7mm Mauser, later 7.7mm Arisaka) - 75 rounds?

Type 92 Machine/Gun Type Ru Machine Gun - 47 or 97 round pan (Lewin Gun - Ru because Ruisu = Lewis):
SMG
Mp 38-43 SMG (Italian Berreta Model) - 20 round - this one is semi-captured. From my understanding they captured the Chinese factory that produced these.

SIG 1930 - could not find to much on this one …

Pistol
Thai contract Nambu Type B

Captured
Oviously there are many more potential captured weapons for Japan, however I only list weapons that would be intresting and distinct (no M2 sawn off nonsence)
Bolt Action Rifle
Type 81 carbine - 7.92×57mm Mauser, later 6.5mm Arisaka - captured from Chinese

Liao Type 13 - 5 round box mag - 7.92×57mm mauser - captured from Chinese (mukden arsenal)
Geweer M. 95 (Dutch Manlicher) captured from Dutch KNIL forces in the Dutch East Indies (modern day indonesia) with Arisaka bayonet and coverted to 7.7x58. - captured from Dutch East Indian KNIL Forces
There are also many British weapons captured by the Japanese in Malaya, such as the SMLE. Since these weapons are already in the game I left them out.
SMG
Bestigui MM-34 - 20 rounds - captured from Chinese
MP18I - captured from Chinese

Sichuan Submachine Gun (7.63×25mm Mauser) - 30 rounds? - captured from Chinese

Mukden Model Type 2 (Chinese version 2.45 ACP of the Type 2 SMG) - captured from Chinese
SIG Bergmanns 50 rounds (Tsingtao version?) - 50 rounds - captured from Chinese?

LMG
ZB-26 modified to shoot 6.5x50 mm - 30 round - (Type Chi 7.9 mm Light) - captured from Chinese

Scoped Browning (Type 4) - 7.7mm - captured from US

Dutch East Indian shortened Madsens of 6.5 mm caliber (sawn off?) - captured from Dutch East Indian Forces
Ground converted .303 Mk II Browning - 1150rpm - captured from US

Pistol
Star model A Carbine - 16 or 31 round mag - 7.63x25 Mauser - captured from Chinese

Dont know
Ground converted Army Type 89 - I asume this is a captured Browning? Not sure

Credits go to
@_DELAVR
@Emperor_Yoshiro
@Valkay
@aizenns
@Killerwolf1024
@GasMasters-live
@TARANCKNI
@Guthix_Auditore-psn
@VINICIUS_LAG
@NonNational
And many others that contributed
in the post listed bellow
Links I used to update the list
List of Japanese weapons for future campaigns - Mess Room - Enlisted
Japanese weapons and equipment - Archive / Suggestions - Archive - Enlisted
Encyclopedia of Japanese small arms weapons - Archive / Suggestions - Archive - Enlisted
Japan Small Arms Balancing Discussion Thread - Game discussion / Japan - Enlisted
Japanese SMGs That are not yet in the game
- Archive / Suggestions - Archive - Enlisted
Fixing Japanese Faction Full Tech Tree
- Archive / Suggestions - Archive - Enlisted
Japanese Mp 38/43 SMG New BR I TT Weapon
- Suggestions / Weapons - Enlisted
Type 2 6.5x30mm - Suggestions / Weapons - Enlisted
九八式旋回機関銃 / The Type 98 Machine gun - A Japanese copy of the MG15 - Suggestions / Weapons - Enlisted
(Some unreleased shotguns)
Japan Customization - Archive / Suggestions - Archive - Enlisted
Общая тема по вооружению Японии [DELAVR]
- Обсуждение игры / Япония - Enlisted
(combined with my own researches which I forgot to add, great historian I am)
- Yes
- Meh
- Nah



































