Beretta Cx4 Storm

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Cx4 Storm
The Cx4 Storm
Place of originItaly
Service history
Used bySee Users
Production history
Weight2.575 kg (5.68 lb)
Length755 mm (29.7 in)
Barrel length422.5 mm (16.6 in)
Width63 mm (2.5 in)
Height190 mm (7.5 in)

Cartridge9×19mm Parabellum
9×21mm IMI
.40 S&W
.45 ACP
Muzzle velocity9×19mm NATO 1400 FPS
Feed system8-, 10-, 11-, 14-, 15-, 17-, 20-, or 30-round box magazine
SightsRear: 2-position aperture flip sight; front: adjustable post
327 mm (12.9 in) sight radius

The Beretta Cx4 Storm is a pistol-caliber semi-automatic carbine aimed at the sporting, personal defense, and law enforcement markets. It is available in two models: one that accepts 92/96 magazines, and one that accepts Px4 series magazines, each available in 9×19mm Parabellum, .40 S&W, .45 ACP, and 9×21mm.

The Beretta Mx4 Storm is an automatic version of the Cx4 Storm.[1]

Design details[edit]

The Cx4 Storm was developed to be used in conjunction with Beretta semi-automatic pistols. For example, the magazines for the Beretta 92FS chambered in 9mm can be used in the Cx4 (also chambered in 9mm). This aids in a smaller loadout – no longer needing to carry separate magazines for the rifle and handgun – and adds redundancy, allowing a person to carry more ammunition without adding weight.

Conversion between Px4 Storm, 92/96 and 8000/8040 Cougar 9×19mm Parabellum/.40 S&W magazines requires two parts (not included with rifle). For Px4 magazines the C5C620 magazine insert and C89210 magazine release button are required, for 92/96 the C5A511 insert and C89109 release, for Cougar the C5A670 insert and C89110 release.[2] The .45 ACP model only accepts 8-round single-stack 8045 Cougar magazines.

The CX4 Storm includes a Picatinny rail that can be extended under the barrel by pushing in the sling button and pulling the rail out by a thumb tab. Each Storm also includes a side rail with two mounting screws, a second can be purchased along with a bottom rail from the manufacturer. The contoured bottom rail is designed to attach under the two side rails. A top rail can also be purchased and installed with a tool that comes with the carbine. Three screws and nuts attach it to the top of the carbine using a pre-drilled hole, allowing the user to use the rail as a template to tap two other holes hidden under a thin membrane of plastic. The correct size drill bit needed for attaching the top rail is not included with the rifle or the top rail kit and has to be purchased separately. A maximum of five Picatinny rails can be utilized using Beretta accessory kits, or the user can use the two present at purchase to attach a number of optics, grips, lights, lasers, bipods etc. This firearm was designed to be very adaptable to customization.

The Cx4 comes from the factory with adjustable iron sights. The front post sight is adjustable for both windage and elevation using the supplied adjustment tool. The rear flip sight has two apertures for snap shooting and long-range elevation selection. Both sights can be folded down when optics are mounted to the optional top rail.

The stock on the Cx4 has an adjustable length of pull. Adjustment is made by the use of stock spacers. The carbine comes with one spacer installed, which may be removed. With no stock spacers installed the minimum length of pull of the Cx4 is 337 mm (13.3 in). To increase the length of pull, additional stock spacers may be purchased separately. A total of three stock spacers may be installed which bring the length of pull to a maximum of 382 mm (15.0 in).

In addition to being able to customize the Cx4 with accessories, it is also able to switch the safety, cocking handle, ejection port, and magazine release to the left side of the weapon to accommodate left-handed shooters.

Dawson College shooting[edit]

The Cx4 Storm was the primary weapon used in a deadly school shooting that occurred at Dawson College on September 13, 2006. The gun had been acquired legally, and a coroner's inquest into the shooting recommended that all semi-automatic rifles should be banned in Canada.[3][4] Sales of the CX4 Storm increased in Canada following the shooting.[5]


Mx4 Storm[edit]

Beretta Mx4 Storm
CX4 Sideview.png
TypeSubmachine gun
Place of origin Italy
Service history
Used bySee Users
Production history
Weight2.48 kg
Length647 mm
Barrel length312 mm

Cartridge9×19mm Parabellum
.45 ACP
ActionStraight Blowback
Muzzle velocity390 m/s
Effective firing range~200 m
Feed system30-round box magazine
Sights2 position aperture sight

The Beretta Mx4 Storm is the military version of the Cx4 Storm[13] pistol-caliber carbine. It has a barrel length of 12 inches, and is capable of automatic fire. The Mx4 can use pistol magazines, or its own 30-round magazine. There is an accessory rail on the top of the Mx4 for mounting scopes, laser aiming devices or flashlights. There is another rail underneath, forward of the trigger, for mounting vertical foregrips, laser aiming devices or flashlights. The Mx4, with a scope, is fairly accurate out to 100 meters, and automatic fire is accurate out to 200 meters. The Mx4 has a reputation, among the many police and security personnel who use it, for reliability, ease of use, and handling[citation needed].


  •  Djibouti in service at least since 2016
  •  India: February 14, 2011 an order for 34,377 carbines was placed by BSF (Border Security Force) personnel. The guns were delivered in 2 batches : The first batch of 17,000 was delivered in September, 2011 and the second batch of 17,377 by March 30, 2012. In January 2012 BSF personnel found excess metal deposits, tool mark scratches, corrosion were found in 2,374 carbines and barrels of 4 carbines bulged when tested. On March 27, 2012 the Indian Home Ministry asked Beretta to replace 573 carbines. It blamed the defects in some of the other rifles due to improper cleaning and use of bad ammunition. Another order of 34,000 carbines were made. The total order of 68,377 Storm carbines amounts to Rs. 2504 crore (417.3 million US$).[14]
  •  Italy: In 2013, the Italian Navy (Comforsbarc) ordered 90 Beretta Mx4 Storm (for Euro 58.606) to be delivered in 2014;[15] second order placed in 2017[16]
  •  Colombia: Fuerza Aerea Colombiana since 2013[citation needed]
  •  Kenya: National Police Service since mid 2017[citation needed]


  1. ^ "MP5 Gets Replaced". 2011-03-07. Retrieved 2011-03-07.
  2. ^ "Converting magazine type in the CX4 Storm". Beretta USA Customer Help. Retrieved 20 January 2011.
  3. ^ "Dawson College killer's gun should be banned: coroner -". Retrieved 11 November 2014.
  4. ^ "Canadian ban on semiauto rifle sought - World news - Americas - NBC News". Retrieved 11 November 2014.
  5. ^ "Archived copy". Archived from the original on 2014-05-12. Retrieved 2012-09-07.
  6. ^ Opencontent. "L'Italia ha inviato 11mila Beretta semiautomatici al regime di Gheddafi". Retrieved 11 November 2014.
  7. ^ "Beretta arms New York agency". Shooting Industry. July 2007. Retrieved 2008-10-27.
  8. ^ O'Connell, Patrick M. (2008-05-30). "St. Louis police want more pistol firepower". St. Louis Post-Dispatch. Retrieved 2008-10-27.
  9. ^ Burgess, Laura (July 2008). "The College of William and Mary Police Choose the Beretta Cx4 Storm Carbine/Patrol Rifle". Beretta USA, Corp. Archived from the original on October 15, 2008. Retrieved 2008-10-27.
  10. ^ "Presidente Chávez juramentó a la Guardia del Pueblo para reforzar la lucha contra el crimen". Noticias24. Retrieved 11 November 2014.
  11. ^
  12. ^ Beretta CX4 Storm Carbine 9mm Semi-Auto, New - Manufactured by Beretta in Italy
  13. ^ "MP5 Gets Replaced". 2011-03-07. Retrieved 2011-03-07.
  14. ^
  15. ^
  16. ^

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