Although considered by some underpowered for combat, it found favor with high ranking Italian officers during World War II. German command in Rome procured examples; these are distinguishable by a “4UT” proof stamp.
The M418 remained in production until the middle of the 1950s, overlapping with the production of more sophisticated guns Beretta had developed in the meantime.
Towards the end of the 1940s a frame in light alloy was developed. Slight aesthetic modifications were also added shortly afterwards.