Y'all, properly made Arisakas are quite safe, if in good condition, right up to the end of the war. What one must look out for is the drill-purpose "rifles" that have the tangs cast integral with the (also cast) receiver. Those are dangerous to shoot with ANYTHING. Proper Arisakas have tangs that are separate pieces. As always let you favorite smith take a look at it.
I've considered picking one up just to mount. I'd ideally like an Arisaka, Kar98K, and a Garand to mount with my Mosin What do Arisakas cost these days?
these rifles are safe, BUT you have to know it is actually a rifle and not one of the blank firing only school or training rifles. some of the trainers were made with cast iron recievers and bolts making them unsafe to say the least. I suspect that this is where the notion that all arisakas are unsafe. some of the training rifles look exactly like the real service rifles and sometimes it is hard to decide if it is a good rifle or not, but there are several books and internet sites to find out if the markings are for the real rifles or not, so there is less of a problem with that. I have fired many different rifles over the years and all have shot well. even the last ditch rifles were accurate. The ammo is expensive, but buy a box or two and get set up to reload and that will come down to a reasonable price.
Unless there is something obviously wrong, mechanically, with the gun in question then it is perfectly safe to shoot.
Rumors of "booby traps" and other hog wash abound. They are complete unsubstantiated.
many last ditch rifles are very very rough, but they are still mechanically capable of firing a cartridge. They are rifles, not pipe bombs.Most Arisakas are NO WORSE mechanically than your average Mosin. Every Arisaka I have seen exhibited better finish than late-war 91/30s.
The fact of the matter is that 99% of Arisakas are perfectly safe to shoot. Even the dread "pipe-bomb" last ditch pieces are fired by there owners with no problems whatsoever.
This knee-jerk "jap rifles are unsafe" attitude is incorrigible, and perpetuated on nothing more than rumor.
The trainers, or school rifles, have no rifling.