http://www.rememuseum.org.uk/arms/submachg/armsmg1.htm
Beretta as you probably know has made 4 runes first was the nice 38a then during the war it was simplified for cheaper and faster production si it was called 38/42 then at end war it was made even more cheaper and faster for production 38/44 and finally after the war it was modified and was send in to production for the new Italian army/police it was called Model 4 (38/49) it has stayed there to these day and is one beset smg in world 3rd only to the famous Swedish k and Sterling also there were other countries that purchased them like Costa Rica, Egypt (small numbers as they had Swedish K and some trade problem later), Indonesia, Dominics, Thailand, Tunisia and in large numbers Republic of the Yemen (because these assholes sold then to every Arab country that was not abele to trade with EU directly)