To muddy the water a bit, the newly formed PLA in China had a many hundred thousand Arisaka left/abandoned/surrendered in China, and many were repurosed to PRC use.
Some of those filtered out into various wars PRC was involved in.
In addition Arisaka, pre war, was sold to places like Thailand, and which would have had the royal crest of Siam on them.
Probably a chamber cast is wanted to see just how it's presently fitted up. Many 7.7s were "bubba" rebored to 30-06 using electric drills. Some of the 6.5s were rebored to various calibers, too.
And, there's more than a ton of fuddlore on whether or not an intact "mum" was legal or not. And all manner of tools, like bench grinders and the like were pressed into use, "back in the day."