New Nambu M66The New Nambu M65/M66 is a Japanese submachine gun manufactured in 1965 by Shin-Chuō Koygo Industries.DesignThe New Nambu M66 is blowback operated, and fires from an open bolt. It fires the 9×19mm Parabellum round, from 30 round box magazines.AdoptionThe firearm was only tested and produced under trials for the considered replacement of the aging M3 [submachine gun] that was supplied by the United States Military during the formation of the National [Police Reserve] after the war.