Japaneses Self Defense Forces 40mm Grenade Launcher Cartridge Case

From Twitter: https://mobile.twitter.com/3175Pigeon/status/1305732984176144384

Google translation of the accompanying text from Japanese to English-

“It seems that the manufacturers of the Self-Defense Forces 40mm grenade launcher case and the cartridge case are different.”

I’m not sure what that means but here are the posted photos.

Brian

Brian, if I see it right this is a 53mm case?

Alex,

YES! Now the comment about the posted photos makes sense, I think.
40x46mm case verses the 40x53mm case shown in the photos.

Brian