[1] The Villar Perosa was somewhat odd, and had sort of a heavy double automatic pistol configuration, with two 25-round box magazines feeding each barrel and a rate of fire in excess of 1000 rounds per minute.
It was originally intended as an auxiliary aircraft weapon but was removed from airplanes to be replaced by light machine guns using rifle rounds.
It is always claimed that the Beretta beat the Bergman MP18 by a couple of months or a couple of weeks in the field but there is absolutely no trace of its use by the Arditi units who were supposed to have fielded it[citation needed], unlike the Bergmann MP 18.1 that appears on many pictures and is cited in both German or Allied reports[citation needed].
The small quantity of Beretta 1918 available after World War I was converted as semi auto carbine for the Forestry Service.
Many technical details are close to the STA 1922 that was adopted as MAS 1924 and used in post World War I limited colonial conflicts.