Since they did change the name of the Te-4 from Type 89 Te-4 to be more correct, they should do the same for these two. Specifically:
The MP 28 (7.65 mm) should be renamed to either “SIG Bergmann” or “SIG M1920”.
The SIG 1920 should be renamed to “Type Be”.
Let’s start with the evidence against the MP 28 (7.65 mm) being such:
The SIG M1920:
The MP 28:
Whilst they may look very similar due to them both being based on the MP 18, there are some key differences:
The magazine release catch on the SIG is on the bottom of the mag well whilst on the 28 it’s on the top.
The mag wells have two different designs on the different guns.
The 28 has a fire selector, with a groove in the stock, above the trigger, which the SIG lacks.
The charging handle (which you can’t see on the pictures here) were also different, the 28 using a hooked charging handle whilst the SIG used a straight one with a round knob.
Now, let’s compare the “MP 28 (7.65 mm)” to the pictures above:
Compared to the MP 28 in game:
As you can see there’s no fire selector above the trigger:
Which we can compare to the MP 28 in game:
And the mag release is on the bottom of the mag well:
We can compare the mag well design to the MP 28 in game as well:
And finally the charging handle:
And once again the MP 28:
I think I’ve shown why these are not the same firearm, and the the Japanese one is, in fact, a SIG Bergmann (or SIG M1920 as it tends to be called as well)
And then as to why the SIG 1920 in game should be called “Type Be” instead, that is pretty simple:
It’s just the Japanese designation of the SIG M1920 they modified with a bayonet lug and a different muzzle to go along with it:
One nitpick about the Type Be however:
The Japanese never ordered them chambered in 7.65x21 Parabellum but 7.63x25 Mauser. Should be pretty easy to fix.
It would make sense to change the description of the other one to also be 7.63 but that one is less important since it’s not the officially adopted version.
(On a similar note:
The SIG 1930 should probably get that M in front of the 1930 like it says in the description as well)
Hopefully I’ve made my case well and clear.
Thanks for reading.
Post Scriptum:
The S1-100 should also be renamed, as the Japanese designation was Type Su. It was also not chambered in 7.65x21 Parabellum but 7.63x25 Mauser like the other ones.