The Beretta MX4 Storm is a submachine gun chambered in 9x19mm Para, with a barrel length of 12 inches. It is select-fire, with an automatic rate of fire of about 800 rpm. The MX4 can use standard 92FS pistol magazines, or its own 30 round magazine. It has in integrated full-length rail for mounting various attachments. They were used by the Alliance of Nations

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