Beretta Cx4 Storm

The.45 ACP model can only use 8000 "Cougar" magazines. The Beretta Mx4 Storm is the submachine gun variant of the Cx4 Storm. It is capable of fully automatic fire, features a 12-inch barrel, and is most commonly seen with a 30-round 9mm magazine that is compatible with Beretta 92 pistols.

Both the Cx4 Storm and Mx4 Storm feature a Picatinny rail on top of the receiver for mounting modern optics, and a tri-rail adapter for mounting flashlights, laser sights, grips and other accessories. The firearm also has some ambidextrous features, such as being able to switch the fire selector, charging handle, ejection port and magazine release to the left side. The Cx4 Storm was developed to be used in conjunction with Beretta semi-automatic pistols so that a person can carry one type of magazine for two types of firearms. For example, the magazines for the Beretta 92FS chambered in 9mm can be used in a Cx4 also chambered in 9mm. Conversion between 92/96, 8000/8040/8045 "Cougar" 9×19mm Parabellum/.40 S&W/.45, and Px4 Storm magazines requires changing two parts, a magwell sleeve and the magazine release button (sold separately). 92/96: C5A511 magwell sleeve, C89109 magazine release button Cougar: C5A670 magwell sleeve, C89110 magazine release button PX4: C5C620 magwell sleeve, C89210 magazine release button

The Cx4 Storm was the primary firearm used in the 2006 Dawson College shooting. The restricted class firearm had been acquired legally, and a coroner's inquest into the shooting recommended that all semi-automatic rifles be banned in Canada. Sales of the CX4 Storm increased in Canada following the shooting, and in 2011, Beretta introduced a non-restricted (19" barrel) variant of the Cx4, making it more accessible. On 1 May 2020 the Canadian government reclassified the Cx4 Storm (in all its variants) to be prohibited firearms.

Italy: In 2013, the Italian Navy (Comforsbarc) ordered 90 Beretta Mx4 Storms (for €58,606) to be delivered in 2014; a second order was placed in 2017. India: procured for use by Paramilitary forces of India. Libya: In 2009 ordered 1,900 carbines, before the civil war. Russia: Russian police received a large order of Cx4 carbines with a lengthened 500mm barrel. United States: Used by Albany County, NY Sheriff's Department (.40 S&W), St. Louis Police Department, and College of William & Mary Campus Police Department. Venezuela: Ordered in 2012 by Comando Nacional de la Guardia del Pueblo (Venezuelan Bolivarian National Guard).