The Beretta Cx4 Storm is a
pistol
A pistol is a type of handgun, characterised by a gun barrel, barrel with an integral chamber (firearms), chamber. The word "pistol" derives from the Middle French ''pistolet'' (), meaning a small gun or knife, and first appeared in the Englis ...
-calibre
semi-automatic carbine
A carbine ( or ) is a long gun that has a barrel shortened from its original length. Most modern carbines are rifles that are compact versions of a longer rifle or are rifles chambered for less powerful cartridges.
The smaller size and ligh ...
aimed at the sporting, personal defense and law enforcement markets. It was designed to accept magazines from different Beretta pistol platforms (
92/96,
8000 "Cougar" series,
Px4) using adapters. The CX4 is available in
9×19mm Parabellum
The 9×19mm Parabellum (also known as 9mm Luger, 9mm NATO or simply 9mm) is a Rim (firearms)#Rimless, rimless, Centerfire ammunition, centerfire, tapered cartridge (firearms), firearms cartridge.
Originally designed by Austrian firearm designer ...
,
.40 S&W,
.45 ACP, and
9×21mm
The 9×21mm pistol cartridge (also known as the 9×21mm GP, 9×21mm IMI, 9mm IMI, 9×21mm Italian, or 9mm Italian) was designed by Jager (Loano, Italy), then adopted and commercialised by Israel Military Industries for those jurisdictions whe ...
models. The .45 model can only use 8000 "Cougar" magazines.
The Beretta Mx4 Storm is the military version 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.
Design details
Both the Cx4 Storm and Mx4 Storm feature a
Picatinny rail
The 1913 rail (MIL-STD-1913 rail) is an American rail integration system designed by Richard Swan that provides a mounting platform for firearm accessories. It forms part of the NATO standard STANAG 2324 rail. It was originally used for mount ...
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
Fabbrica d'Armi Pietro Beretta (; "Pietro Beretta Weapons Factory") is a privately held Italian firearms manufacturing company operating in several countries. Its firearms are used worldwide for various civilian, law enforcement, and military p ...
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
Legal status in Canada

The Cx4 Storm was the primary weapon 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.
Users

*: 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.
*: procured for use by
Paramilitary forces of India.
*: In 2009 ordered 1,900 carbines, before the civil war.
*: Russian police received a large order of Cx4 carbines with a lengthened 500mm barrel.
*: Used by
Albany County, NY Sheriff's Department (.40 S&W),
St. Louis Police Department, and
College of William & Mary
The College of William & Mary (abbreviated as W&M) is a public university, public research university in Williamsburg, Virginia, United States. Founded in 1693 under a royal charter issued by King William III of England, William III and Queen ...
Campus Police Department.
*: Ordered in 2012 by ''Comando Nacional de la Guardia del Pueblo'' (
Venezuelan Bolivarian National Guard).
References
External links
BerettaBeretta Cx4 Storm web site{{Beretta firearms
Cx4 Storm
Semi-automatic rifles
.40 S&W firearms
.45 ACP firearms
9mm Parabellum firearms
9×21mm IMI firearms
Rifles of Italy
Carbines
Military equipment introduced in the 2000s