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 customization
Bolt Action Rifle
Type 18 Murata rifle - 11mm - 1 round
Type 22 carbine (bottom) - 10.97mm - 1 round
Type 44 carbine 5 round Arisaka - First picture is the Cavalry version, second the engineer version - (But I think they are the same)
Type 30 rifle - 6.5×50mm Arisaka - 5 rounds - one interesting note is that a copy of this rifle was produced by the Manchurian puppet troops of the Japanese using 7.92×57mm Mauser (so great for event squad).
Type 35 rifle - 6.5x50mm - 5 rounds - Navy’s atempt to replace their Murata rifles with an upgraded Type 30
Type 1 TERA - 6.5mm - 5 rounds (foldable Type 38 Carbine for use by paratroopers)
Type 2 TERA - 7.7mm (had a folding anti-aircraft sight seen in the second picture)
Type 38 with 30 round Type 96 magazine
National Defence Rifle - Arisaka cartridge (7.7×58mm top rifle, 8mm lower two rifles)
Shotguns
Murata shotgun
Semi-auto Rifle
1932 Watanbe rifle - 8 rounds of 6.5x50SR (thanks DELAVR for the extra help on this one)
Kokura Experimental Semi Auto Rifle - 7.7mm - 5 rounds
Prototype No 1 Nippon Special Steel Company
Type Ko Carbine
Type Ko (long)
Ogura prototype automatic rifle (Type Ko chambered in 7.7mm) - 10 rounds(?)
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 interesting event ‘what if’ weapon
Type Hei Prototype - 10 rounds
Type 4 prototype
Select fire rifle
Type Hei Auto 20 round version
Sniper Rifles
Type 38 sniper rifles (specifically not Type 97) made for testing experimental 4x scope
Prototype Sniper Rifle Kokura arsenal (Type Ko scoped) - 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
Experimental Type 11 with 20 round box mag
Prototype Type 11 Model 1 - 30 round - 500rpm
Prototype Type 11 Model 2 - 30 round - 500rpm
Prototype Type 11 Model 3 - 30 round - 500rpm
Type 91 - modified Type 11 for use in tanks (This version has no stock, smaller grip and brackets for mounting 1.5x30 scope)
Scoped Type 91:
Scoped Type 96
Scoped Type 99
Type 96 with shield
Type 99 with shield - shield seen bellow
Type 99 LMG folding versoon (for para)
Experimental Type 1 light machine gun Model I - easier to disassemble for use by paratroopers (First picture is Model I A, second is Model I B)
(Little information on this one) Experimental Type 1 light machine gun Model III - 7.7x58mm - 30 round mag
(Little information on this one) Experimental Type 1 light machine gun Model II Ko - 7.7x58mm - 30 round strip (first picture) and the very similar Experimental Type 3 light machine gun - 7.7x58mm - 30 round strip (second picture)
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 personnel 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
Mortar
Type 98 50 mm mortar (For BRII or BRIII)
Type 97 81 mm Mortar - (For BRV)
Other
Bouganville improvised grenade launcher Type 99
Crossbow with explosives - Japan is crazy
Japanese Longbow (Yumi) - used in Shanghai by some crazy jap
Engineer Build Guns
type 95 75mm gun (engineer build)
Experimental Type 2 57mm at gun
Type 41 75 mm mountain gun
Type 90 field gun - 75mm (engineer build)
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 specifically 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 patent described a bicycle with a slot for a rifle
Imported, licensed 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 bottom 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):
Scoped Browning (Type 4) - 7.7mm - Japanese version of a Browning Type machine gun
Type 89 7.7mm pictured first (Navy version) and Type 99 7.7mm pictured second (Army version). Both are Japanese licensed copy of the Vickers Class E machine gun
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.
Pistol
Thai contract Nambu Type B
Captured
Obviously there are many more potential captured weapons for Japan, however I only list weapons that would be interesting and distinct (no M2 sawn off nonsense)
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 converted 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
MP 18/I “Tsing Tao” Submachinegun - 7.63x25mm Mauser - 25, 32, 40 and 50 round mag (lots of choice here) - 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
LMG
ZB-26 modified to shoot 6.5x50 mm - 30 round - (Type Chi 7.9 mm Light) - captured from Chinese
Dutch East Indian licensed Madsens of 6.5 mm caliber (geweermitrailleur M15) - captured from Dutch East Indian Forces
Dutch East Indian licensed and modified Madsens with shorter barrel of 6.5 mm caliber 40 rounds mag (Karabijnmitrailleur) - basically a sawn off Madsen
Ground converted .303 Mk II Browning MkII - 1150rpm - captured from US
Pistol
Star model A Carbine - 16 or 31 round mag - 7.63x25 Mauser - captured from Chinese
The Type 17 Shanxi “Boxcannon” - .45 acp - ammo capacity of 10 rounds - may also include a wooden stock - Chinese copy of the C96
The Royal - pistol from Chinese warlord - 7.65mm - 12-round - captured from Chinese
Anti-Tank
Tankbuks M.18/1000 (Solothurn, but bigger variant) - 20x138mm with optical sight - captured from the KNIL. The Japanese also had licensed Solothurn 100 AT weapons already in the game for the German faction, but I thought this is a more intresting version of the weapon.
Don’t Know
SIG 1930 or 1935
SIG MKMS 1935 - 7.63mm mauser - 40 round - 900rpm(?) - captured from the Chinese (however, I could find very little about this weapon) - don’t even know which picture …
Credits go to
_DELAVR
Emperor_Yoshiro
Valkay
aizenns
Killerwolf1024
GasMasters-live
TARANCKNI
Guthix_Auditore-psn
VINICIUS_LAG
NonNational
Sombralix
Aussie-Tachanka
khtk395
Декард
mg42gun
Kriegerfaust007-live
And many others that contributed
in the post listed below
Links I used to update the list
links
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
(8cm Navy Anti-Tank Rocket Launcher - Suggestions / Weapons - Enlisted)
Better Japan at gun for low br - Suggestions / Weapons - Enlisted
MR18/I “Tsing Tao” submachine gun - Suggestions / Weapons - Enlisted
Pandora box open^_^: Type II submachine gun of the Mukden arsenal - Suggestions / Weapons - Enlisted
Machineguns - Game discussion / Japan - Enlisted
The Type 17 Shanxi “Boxcannon” - Suggestions / Weapons - Enlisted — official forum
(combined with my own researches which I forgot to add, great historian I am)
(I reset in on accident … so most votes got removed)
- Yes
- Meh
- Nah
.
