This has been a long standing mistake in all sorts of games and web pages.
But before I show some sources lets have a “brief” introduction into the terminology I will be using.
Introduction
Model 3 = Name for a few SMGs that would develop into the initial Type 100 SMG. Visually they’re very similar to the Type 100 and there are about 4 variations but lets not get into that here.
Q: Why Model 3 instead of Type?
A: Because Type 3 would imply 1943 adoption after the Japanese calendar (Imperial Year 2603) according to the naming system adopted in 1929, experimental weapons didn’t use shiki.
試製三型機関短銃 → Experimental Model 3 Short Machine gun
一〇〇式機関短銃 → Type 100 Short Machine gun
(yes I know the number is written first in Japanese “100 Type”)
式 - shiki - type
型 - kata/gata - model
号 - gou/gō - mark
Type 100/40 = The early pattern of the Type 100 SMG, easily identified by the bayonet mounting bar below the barrel and range adjustable rear sight. Adopted 1941.
Type 100/40 Para = Early Type 100 converted to paratrooper configuration with a folding stock hinge. (Called Type 100 Special in IJN documents, I know)
Correct Rate of Fire
Now lets get to the main point, the correct rate of fire.
700rpm. Not 450.
For both Type 100/40 and Type 100/40 Para.
To prove this I have 3 separate sources to share,
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A page from a 1943 manual (only image available)
“Rate of fire about 700 rounds per minute” -
An article on the Type 100 from the Japanese “Gun” Magazine, 1976 January. Page 26:
“発射速度は毎分700発の性能を有している。”
“It has a rate of fire of 700 rounds per minute.”
This source is particularly important as the author Keiichi Kunimoto (国本圭一) fired the Type 100/40 Para on a US range.
He’s an experienced shooter who can certainly tell the difference between 450 and 700rpm. -
“Introduction to Rifles, Handguns, and Machine Guns: A Thorough Study of Japanese Small Arms”(小銃・拳銃・機関銃入門―日本の小火器徹底研究) by Sayama Jiro(佐山二郞) a Japanese military historian who wrote several books. Page 390 of this book:
Sayama writes:
“十一月の試験の結果、三型改修は機能良好となり、故障もなくなったが、三〇発の弾倉を射ち尽くすのが二・〇秒から二・五秒と発射速度が過大であったので、これを概ね七〇〇発/分を標準とするよう緩衝バネ、復座バネを改修した。”
“As a result of the test in November, the Model 3 improved function was good and there were no malfunctions, but the rate of fire was excessive, as it took 2.0 seconds to 2.5 seconds to exhaust the 30-round magazine. The buffer spring and the return spring were modified to standardize this to approximately 700 rounds per minute.”
(note: November 1939)
No changes regarding the rate of fire are noted after this so the Model 3 700rpm carried over to the Type 100/40 on adoption.
The modified buffer and return spring can be seen in a picture from the 1976 “Gun” magazine article on page 28:
Origin of the 450 number
Q: So where does the 450rpm number come from? Basically every English source seems to state it.
A: There are some theories among Japanese researchers, one of them is the diagonal line in the number 7 that some people write, which could make it look like a 4.
I’ve seen some books report the RoF 400-450rpm so this could indeed be possible.
Especially considering Model 3A and Model 3B had a rate of fire of 755rpm, 755->455->450?
I assume no one corrected this mistake in English sources so far because well… the Type 100/40 is rare, I’ve yet to ever see one fired on video. So everyone just copies the number written on wikipedia or from older English books. Maybe one day someone will be able to track down who was the first to make this mistake.
In Enlisted
Alright now, would this change cause issues in the current game balancing?
Well it would make the Type 100 stronger, however I don’t see this as an issue considering there are much worse examples from the pacific campaign levels, such as:
lvl.11 - jp - Type 95 Shin gunto - Sword
lvl.11 - us - Browning Auto 5 - Shotgun
lvl.15 - jp - Sig M1920 (wrongly called MP28) - 480rpm
lvl.15 - us - Owen Mk.I - 700rpm
lvl.31 - jp - Type 4 - 320rpm (semi)
lvl.31 - us - M2 Carbine - 750rpm
So if a difference like on lvl.31 with a SLR vs what effectively plays like an assault rifle (for every rifleman) is ok then I see no issue with buffing both Type 100/40s to their real rate of fire.
As a side note for American SMGs, the terrible Reising could use a better sight picture (currently way too zoomed in) and the M3 could probably do more damage to compensate for the low RoF.
If you made it this far thanks for reading.
Sources
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Type 100 manual from the Weapons Course (Showa 18)(1943). image taken from this post: https://twitter.com/matsumotomorio/status/1520738676866658304 thanks to Mister Morio for making me aware of this issue in the first place, I knew this for a while thanks to him but haven’t had the time to put it in a post until now.
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“Gun” Magazine, 1976 January edition, images provided by a friend of mine.
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“Introduction to Rifles, Handguns, and Machine Guns: A Thorough Study of Japanese Small Arms”(小銃・拳銃・機関銃入門―日本の小火器徹底研究) by Sayama Jiro(佐山二郞) image taken by myself.
Additional sources:
- The Japanese → English translation basis for Type, Model, Mark is taken from this article on Japanese Gas masks The Evolution of the Japanese Army Gas Mask (1918-1945) as well as the book “Japanese Military Cartridge Handguns 1893-1945” by Harry L. Derby and James D. Brown
- the 7->4 theory is from this message: https://twitter.com/waltherP383/status/1521128356800253952 , there is some more speculation about the origin of the mistake in this thread as well.