The Beretta Mx4 Storm is a new submachine gun version of the Beretta Cx4 Storm semi-automatic carbine. The Mx4 has been designed for the Indian Ministry of Home Affairs who should be receiving their first shipment in the next 12 months.The gun is chambered in 9x19mm NATO. It features a 12" barrel and has a total length of 25". It weights 6.28 lbs (including magazine). I am guessing that the magazine pictured is Beretta's 30 round magazine. I could be wrong, but it looks to me like the barrel is threaded for a suppressor and a thread protector has been screwed on.
Beretta MX4 submachine gun is the newest product of the world's oldest gun making company, Beretta of Italy. It was first announced during IDEX 2011 exhibition, along with information that Indiaordered 34 500 Beretta MX4 submachine guns for its Ministry of Home Affairs forces.
Beretta MX4 submachine gun is based on the successful Beretta CX4 Storm semi-automatic carbine, originally developed for civilian and security use. It uses same blowback operated action with polymer body of the gun and fixed shoulder stock, as well as same ambidextrous controls. Charging handle can be set at either side of the gun, ejection also can be arranged either to the left or to the right, according to user preferences. Double stack magazines are inserted into the pistol grip, standard magazine capacity is 30 rounds. Beretta MX4 submachine gun is normally equipped with iron sights, and an integral Picatinny rail is provided at the top of the receiver for installation of additional sights (Red Dot, IR/Night etc)