Help with Beretta CX4 Storm conversion


July 17, 2010, 06:00 PM
Hi all, I hope this is the best place to post this question. I have a Beretta CX4 Storm 9mm carbine. It has the capability of being converted to a left handed model (ie. casing ejection out the left side, safety switch, and charging handle on right side). I am trying to find an in depth guide on how to do this. I can probably figure it out on my own but really don't like to Macguiver it with firearms.

I did find some vids on youtube a few months ago that were very low quality but even those I don't seem to see. It was posted somewhere that a trip to the gunsmith is recommended (for what part I don't know) but I'm hopin I can handle it myself.

TLDR version: Links to guides for left handed conversion of Beretta CX4 Storm 9mm

Edit: I know 9mm is a handgun cartidge but I didn't want to put this thread in handgun section :)

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July 17, 2010, 07:09 PM
When I got mine, I switched it to left handed just to see if it was difficult. It was my first gun and I only had a YouTube video to show me how to do it. There are some good videos out there that explain it clearly.

July 17, 2010, 07:21 PM
Like I said in my original post I can't seem to find any videos on youtube. Could you perhaps link the video you used?

Edit: My main concern is switching the ejection port.

July 18, 2010, 08:48 AM
The CX4 is perhaps the most Lefty-friendly gun out there, IMO.
It's very easy to do - let me walk you through it.

There are three elements to switch to Lefty: the bolt, the mag release, and the safety. The charge handle can be on either side.

for the bolt: (this takes less than a minute)
Pull the main pin and disconnect the upper from the lower.

On the upper, pull back on the charging handle to remove the bolt assembly from the upper receiver. (the handle pulls out from the bolt through the round hole at the end of it's slide path.)

On the top of the bolt, right near the back end where the springs protrude, is a metal clip. This can be removed by pulling straight up on it. I've been using the recoil spring to help push it it it might pop off.

This clip holds the recoil spring assembly and the ejectors in the bolt. when it is off, you can lift up and out the recoil spring assembly; then the ejector assembly from the left side, and the solid piece ejector rod on the right.

At this point you've got the bolt block with that little piece of plastic covering one port-hole. knock it out, and put it in the other side....or don't; i removed mine entirely.

Then put back the two ejector pieces in the sides of the bolt, but on the opposite sides: with the piece with the spring on the right (to push casings out the left side).

Recoil spring back on the top, with the clip back on top of the bolt and those three elements.

Reinsert bolt into upper, aligning the bolt with the hole for the charge handle. Reinsert charge handle (as a lefty, i like it on the right side for off-hand operation).

Re-assemble the upper and lower and you're good to go with left-side ejection.

For the mag release: (i did this years ago when i got mine, and haven't tinkered with it since) You might need some needle-nose piers or forceps for this.

Disassemble upper from lower; look down mag-well on the lower. You can see a loop/bend of a spring (that looks a bit like a hair-pin) on the inside-front of the mag-well about 1/2 an inch down, at about the level of the top of the trigger. Pull that little guy out and up.

The mag-release button should be loose in there now. Pull it out the one side, reverse it, and in the other side.

Now the hard part....reinsert that hair-pin spring: takes a couple minutes but you'll get it.

As for the Safety: You've got to disconnect the bolt-release lever on the left side of the lower receiver first.

This is done by holding the lower receiver and looking down at the exposed action: you'll see that when you toggle the bolt-release button, a metal part goes up the left side of the action to the front of the housing, and sits in a hole in the release-button.

By pushing back on that piece (towards the butt) you can align the knob on the mag-release piece with the hole on the metal piece. The Mag release should drop right out.

Now you can turn up that internal piece, and back a hair, and it should pop out too.

The bottom of this piece holds the safety-bar in place; so with it gone, you can slide out the safety, reverse it, reinsert it, and reinstall the piece...careful of the spring in the front right side of the action area. It needs to be sitting on the track in the piece you're re-installing.

From there, put back in the bolt-release piece and realign/insert...slap the upper and lower back together, and you're good to go.

Once you see how everything fits together, you'll be able to swap it out from lefty to righty and back in a matter of minutes.

Hope this helps. It's really quite easy, but i know writing isn't pictures isn't video....

July 18, 2010, 09:08 AM
I have the 45ACP, purchased in 08. I am lefty and immediately converted it to left hand use. The owners manuel explained it - very easy 4-5 steps and didn't require any tools.

Check their web site - it probably explains the process.

July 18, 2010, 04:45 PM

Here is the Cx4 manual, although desidog seems to have already covered it.

This guy has a bunch of manuals posted online, but he warns people that they open more than they need and use a ton of bandwidth he'll block the IP address from future visits.

July 19, 2010, 02:27 PM
Thank you very much for your help. I'll look for my manual and skim through that as well. I'll let you know how it comes out.

July 19, 2010, 02:38 PM
Great! Don't skim, actually read it. Enjoy your CX4. :)

July 19, 2010, 02:42 PM
Well I've read the manual before just didn't notice the section on reversing the controls. I hate how the manual has the English section in the middle of the booklet instead of the front.

Nice pic too!

July 19, 2010, 02:44 PM
Thanks. The english section becomes harder to find with each new purchase. ;)

July 19, 2010, 04:42 PM
Finished! I haven't fired it but am pretty sure I did everything right. It was all easy but desidog you did forget to mention when reversing the mag release to switch that little tab that holds the mag in place from top to bottom. Pretty dam good instructions other than that. Luckily it was obvious enough after the magazine kept falling out :)

Thanks for everyone's input.

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