It appears the Japanese had assault rifles do Italian weapons next.The Arms of the German and Japanese Empire of the 1950s and 1960s
Fun fact, the MP-5 was originally going to be called the MP-64 IOTLI do recognize some of the German ones: MG-61 is OTL's Heckler and Koch HK-21 (some call it the best LMG in the world, but partisans of the MAG by FN will disagree), the FMP-54 is the Uzi, and the MP-64 is the MP-5.