Last Ditch Arisaka's are scarce, I only remember seeing one on a wall of a gunstore in the 1970's. The ones that were in the country at that time were all WW2 bring backs, rifles that came back in duffle bags.
There are scattered reports of last ditch rifles being as "strong" as regular production, maybe some are and where. However Last Ditch rifles were made when Japan was under extreme duress. It is impossible for well feed Americans to comprehend Japanese bombed out cities, bombed out factories, bombed out railroads/shipyards/roads during the last part of the war. Gen Curtis LeMay was running out of targets! My Dad was there in Feb 1946 and virtually everything standing had been blasted off the face of the earth. He remembered charcoal powered vehicles chugging away in the street, Japanese civilians huddled around charcoal cookers. And then, the Japanese used Chinese/Korean slave labor in the smelters and steel factories. The Japanese used slave labor whenever and where ever they could and treated the slaves badly. Slaves did things to sabotage the products they were making even though the punishment was death. Given the uncertainty of slave labor steels, I would not trust a late period Arisaka regardless of any claims that Last Ditch rifles are as good as regular production.
A got to meet an Engineer who worked on firearms product liabilty cases. He had seen a lot of blown up firearms. It was a shocker to hear him say "don't shoot war time production, and that includes ours!"
This reflects WW2 attitudes in the US
2020 Sept Military History Magazine
Close Enough, -the proximity fuze was the best kept Billion dollar Allied Secret of World War II
Program Manager Merle Tuve directives, posted on John Hopkins APL Maryland Laboratory walls:
I don’t want any damn fool in this laboratory to save money. I only want him to save time.
Shoot at an 80 percent job; we can’t afford perfection
Don’t try for an “A”; in a war “D” is necessary and enough, but an “F” is fatal
The best job in the world is a total failure if it is too late
Our moral responsibility goes all the way to the final battle use of this unit; its failure there is our failure, regardless of who is technically responsible for the causes of failure. It is our job to achieve the end result
The Japanese were in worse shape than the US, so a D would have been an A at the end.
I would have liked to have owned a Last Ditch just to show to people what happens at the end of modern industrial wars, when Nations and people are ground to immiseration. It makes a good morality play as modern industrial wars don’t end with a decisive battle, as TV’s and Movies pretend, in fact, they don’t end for years. They go on and on, with both sides grinding each other down until the weaker runs out of people and their industry collapses. The winner is the one with the most people and production at the end. And the victor's don't feel like winners, rather they act like surviors.