I have never fired Nambu. Had a T14 and a T94 in the past, but no ammo.
The tone of the following youtube video is very negative on T14. A gun looks so nice having so many problems is abnormal.
https://www.youtube.com/watch?v=dc87joWmHFo
But, I am curious after watching this video -- I will buy a nice T14 back in future, to see whether it's only their sample got all those issues, or those issues being more common...