The Beretta CX4 Carbine Magazine Extension for the .45 Storm
  Modern Sporting Rifle Like a Beretta CX4 is not an Assault Weapon.
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Modern Sporting Rifle Beretta CX4
Carbines and Semi-Automatic rifles

The Beretta CX4 Storm is a "MSR" Modern Sporting Rifle Carbine Style

Most gun owners know a Carbine is a Rifle that fires pistol ammunition. They can also be called a MSR.

History of the Beretta CX4 Storm.



Beretta CX4 Storm 45.Magazines are becoming hard to find.

This site will show you an option for extending the capacity of the stock magazine from 8 to 10 rounds.

  • +2 Round Extension for the .45 Caliber CX4 Storm
  • Test Fire of 10 round 45 cal magazine (video)
  • Review of Modification
  • Other Options: Non Beretta Magazine by PRO Mag.
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Taylor Freelance .45 caliber magazine extensions
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Magazine Extension

Here is how the magazines looks when locked and loaded in the .45 Caliber Beretta CX4 Storm Carbine, adding an additional 2 rounds to the stock 8 round magazine. Robin Taylor of Taylor Freelance ( responded to my query on the same day and instructed me on a solution

Beretta CX4 with Mag Extenstion

Magazine Extension Video

I have made a short video of the installing of the magazine extent ions for the 45 caliber.(here)

Test of the conversion to the 2 Plus Extension.,

After loading the converted stock Cougar 8000 mag with 10 rounds, we loaded 1 in the chamber so we could fire all 10 rounds plus 1.

Here is the result.

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All 10 rounds fed perfectly and 11 rounds were fired without a jam or ms-load

Here is a SierraPapa Mag Extension to increase the capacity of 8045 (Cougar) series CX4 magazines to 15 or 16 rounds. >>>More


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Mag Extensions for the 45 Caliber Carbine Beretta CX4

Review of the modification

The springs in the stock Cx4 .45 caliber magazine in my case were extremely stiff. I had a very hard time loading them with 7 rounds and never could get the 8th round in the clip.

Others in the Forum have had the same issue and the best advise is that they will loosen with use.

After installing the extension I can now easily load 10 rounds.

The Extension gives you 2 additional rounds to add to the capacity for a total of 10. With 1 in the chamber you can have an eleven shot string available.

The Extension is very easy to install but does require a little tweaking of the locking plate. No modification to the Beretta CX 4 Carbine is required what so ever.

Magazine fits the weapon very well and after cycling a clip full of cartridges. I had no jams or ms-feeds.

Other Options

I found that Promag makes a 9 round magazine for the CX4 Storm. I suggest you go to their web site and get the part numbers and search the web for a better deal. Midway America has the lowest price that I have found. Impact Guns has them also.


I hope other .45 Caliber CX4 Storm owners find this helpful if you are looking for extra magazines or higher capacity mag's.

If you are a Beretta owner, I highly recommend the Beretta Forum.

For Optics, Rails, and accessories try Impact Guns.

For the +2 45 Caliber Magazine Extension try Taylor Freelance

Return to the Modification Instructions for the +2 Magazine Extension.



Magazine Extender

Adding 2 additional rounds to the 8 round Beretta magazine

I found an option on The Beretta Forum . Robin Taylor of Taylor Freelance ( is making custom magazine extensions for the Cx4 .45 caliber. Since I was getting tired of reloading the two original 8 round mag's, I purchased a couple of these extensions. They arrived within a week of purchase via US Mail. And as you will see later I did have a slight problem, however, the folks at Taylor Freelance were extremely helpful in solving the problem.

Sierra Pappa also has many accesories for the CX4. Recently added is a SierraPapa Mag Extension to increase the capacity of 8045 (Cougar) series CX4 magazines to 15 or 16 rounds. >>>More



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Read about Mag Extensions for the 45 Caliber Carbine Beretta CX4



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