So far, Japan only have 1 TT assault weapon in Br5, despite it has a good rate of fire, its damage is low. I think adding another one for Japan is necessary.
Here are 3 weapons that I think we can add in the tech tree, none of them are copy paste weapons and I’ve already wrote topic about each of them.
Type 17 assault machine gun
It’s a Chinese copy of the M1923 Thompson, chambered in .45 ACP, and has the same ROF(810 rounds/m) of the Thompson 7.63(also based on M1923) and M1928 Thompson.
However, its damage would be higher(8.8)due to its 14 inch barrel. So it’s like a 50 round version of the Thompson .30 but with slower rate of fire.
Fedorov Avtomat M1923
The M1923 is the later version of the Fedorov Avtomat, it has a front sight cover, different rear sight, and its cleaning rod is removed. The Japanese may have confused the production year with the model designation, since production of the Fedorov rifles ended in 1925.
None of them are copy paste. The US has variants of the M1921AC or 1921/28 in their TT or as Premium and event weapons. And Japan has a 20 round version of the gun.
The Fedorov Avtomat is not the one suggested here ither and the Type 17 is a copy of a Thompson M1923 of which no version are included in the game.