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Umarex Beretta Cx4 XT CO2 rifle video review | Gunmart
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Umarex Beretta Cx4 XT CO2 rifle

Jules Whicker tests the Beretta Cx4 XT CO2 rifle

Brocock recently sent me the XT version of the Cx4 CO2 powered semi auto rifle, which comes complete with a host of “tacti-cool” add-ons, including a moderator, a forward rail mount, a Walther QSB combined vertical fore-grip and bipod, and a Beretta-branded 4x32 TriTac (tri-rail tactical) scope.


First on was the moderator, which attaches to the barrel by way of two grub screws. A single-chamber design, it nevertheless does a passable job thanks to its foam lining.

As for the rail mount, this adds short side and bottom rails to the long Picatinny rail between the “iron” sights that –in the absence of the “stowaway” bottom rail found on the original pistol-calibre version - enables you to mount a bipod plus any lasers or lights you might want to add.

The QSB (Quick Shot Bipod) is also a good accessory. As a vertical fore-grip it aids control and makes up for the partial obstruction of the fore-end by the rail mount. But push the ribbed button at the rear with your thumb and a pair of bipod legs pop out from the base. A similar “GPS” (Grip-Pod System) bipod is currently in use with the US military, so it provides a degree of tactical cool, as well as a double dose of practicality.

Finally, the Beretta TriTac scope should be tailor-made for the Cx4, as its high integral mount features a see-through clamp that is notable for its finger-friendly tensioning bolts and its lack of the transverse arrestor bar, characteristic of the standard Picatinny system. This would be superfluous on the recoilless Cx4, and its omission makes it possible in principle simply to slide the scope back or forward on the rail until the correct eye-relief is obtained. Inexplicably, however, the mount hasn’t been made quite high enough to clear the rear sight-protectors, with the result that it has to be set up too far from the shooter’s eye to use without a degree of strain.

Otherwise, it’s all good news: the TriTac goes for a compact 4x32 format that is well suited to the Cx4’s proportions and performance, and features low-profile, finger-adjustable turrets, unusually, but neatly, positioned just behind the objective bell. It also has a mil-dot reticle. The definitive feature of the TriTac scope, however, is its main tube, with its three integral Picatinny rails. As well as complementing the tactical styling of the Cx4, these also allow you to mount your lights and lasers higher and closer to the carbine’s balancing point if that’s how you prefer them.

It was certainly fun trying out all these accessories, and the bipod and scope undoubtedly helped put rounds on target, whilst the extra kit adds inertial stability, but all the same I’ve a sneaking suspicion I prefer the sleek, snag-free lines of the unadorned Cx4.

Setting up

It was easy to get the Beretta up and running. Squeezing the catches on either side of the stock to detach the butt-pad gives access to the CO2 capsule housing, into which you simply screw an 88g capsule that provides enough gas for around 240 shots. The magazine is unusual, being a rubberised plastic belt, but after inserting a pellet into each of the chambers and checking that it slides smoothly on its runners, you simply slot it into the base of the pistol grip until it clicks into position.

One point worth noting here is that merely pressing pellets into the magazine with your digit will cause jams, but if you take the time to seat them properly with the “dibber” supplied you shouldn’t get a single stoppage.

The sights on the Beretta consist of a rear aperture, adjustable for windage by means of a small screw set into the right-hand side of the large sight protector, and a fore-sight post that offers a choice of around a dozen elevation settings, selectable by turning a corresponding screw at the front. The sights gave a good instinctive picture, with the straight stock delivering a solid cheek-weld, and I found that a little airsoft reflex sight was just the right height to co-witness with the “irons”. The only negative was the way the chunky sight-protector blades restricted the field of view.

Ready to go

With the carbine gassed-up, loaded and ready to fire, pull the charging handle to the rear to index the magazine, and push the safety button, located just above of the trigger guard, to the left and into its “FIRE” position: indicated by a red band.

When you pull the trigger, which is a heavy-but-predictable 11 lbs, the Cx4 will send a pellet downrange at around 390 FPS from its 17.5” barrel and, thanks to its blow-back action, will keep doing so until you’ve expended all 30 rounds in the magazine. For added realism, each time you fire, a sliding panel mounted inside a dummy ejection port in the left-hand side of the action flicks backward. This is fine for southpaws like me, but may be slightly distracting for right-handed shooters. The original Cx4 can be configured for either left- or right-hand use, but why Umarex chose a “hybrid” right-bolt/left-port setup for their CO2 version escapes me.

The Cx4 preferred RWS Superdomes to the Umarex wadcutters supplied. However, grouping wasn’t so good; as soon as a cluster began to form the Cx4 would throw a couple wide. This is probably down to variability in the magazine/barrel interface, and the fact that the barrel itself is un-rifled. Of course, a miss is quickly compensated for when plinking, but to my mind inconsistency of this sort makes the Cx4 more suited to tin cans than scoring targets, and inappropriate for ratting, despite its rapid action and compatibility with lamps and lasers – which is a pity.


The Cx4 was immense fun to shoot, but thanks to its shortcomings in the accuracy department, the Beretta’s lightweight polymer build, capacious magazine and super-fast action actually made it feel more like a clever toy than a “proper” gun. However, when it comes down to a fun-gun for low powered plinking, this CO2 powered semi-auto is virtually unbeatable!

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Technical Specifications
Model Umarex Beretta Cx4
Calibre .177 (4.5mm)
Stock Glass-fibre reinforced polymer
Barrel Metal (unrifled)
Receiver Glass-fibre reinforced polymer
Action CO2 powered
Magazine 30-shot rotary belt
Power Supply 1 x 88g CO2 capsule (£10)
Shots per refill 240
Muzzle Velocity 390fps
Muzzle Energy 2.6 ft/lbs (with Walther pellets)
Safety Manual cross-bolt
Overall Length 30.75" (780 mm)
Barrel Length 17.5" (445 mm)
Weight 6lb 2oz (gassed & loaded)
7lb 13oz (in full XT order)
Sights Adjustable open sights fitted
Price £260 for Cx4 and standard accessories;
• 1 x 30 round magazine
• ABS travel case
• Instruction booklet

£400 for Cx4 with XT Kit;
• TriTac 4x32 Scope
• Forward R.I.S.
• QSB fore-grip/bipod
• Moderator/compensator

All Prices Are Guides Due to the Changes in US & European Exchange Rates

Gun Mart Shooters Forum - Get Involved in the Discussion!
User Comments
  • I must disagree with some comments of your review.The velocity of the correct CX4 STORM IS 560 FPS NOT 360.I have the this weapon and it's only fault as far as I am concerned is getting the correct eye distsance releif.Though with patience and correct posture ,can be done.As for vermin control I have ratted,pigeoned and other small vermin.Admittedly it
    must be an accurate shot with correct impact point and pellet.At thirty feet with out scope I van maintain a 1 " group.With scope even less and often rounds going nearly through an already made hole in paper target with Walther/Umarex TMB II BIPOD.The only complaint is it took me an 88g cylinder and 11 or 12 reloads, with the eye releif problem to zero the sight
    and on reloading the Storm with a new Co2 cylinder ,my sight was 5 inces
    high and left at 45 a degree angle.With a few clicks on the eccellent scope
    I was bang on again.So it can be used for more than a "PLINKER".The Walther/Umarex Laser light/flashlight is excellent.I love it for short distance vermin control and all round fun.It's well worth the money and I am sad that at 46 I probably won't get enough years out of it due to my previous Job (ex-forces) leaving me too ill to work again and only living to 60 if lucky.The quality and build of the Storm and Walther Umarex accessories are unbeatable for price.I handle mine like it's aline and it's as pristine as the day I got it.As for spares my dealer has told me it has been banned for sale now,whether just in UK I cannot tell you.I am hoping for two spare magazines and a silencer/modulator.I would recommend it
    to those who can afford it.If not go for the Crosman Nightstalker.Very simular but only twelve round rotary mags,but it has the Mohawk iron sights,which are accurate for the rifle without the need for a small scope (needs a high mount set) and very short scope.The front sight is like the
    old army issue S.L.R and rear sight copied from the S.M.G.I can hit a spinner target at 50 ft with the sights as they are easily adjustable.Also Co2 88gm.

    Comment by: Richard Sharpe     Posted on: 28 Mar 2011 at 12:04 PM

  • Thanks for your comments. Glad your model is producing 560fps, but our test model only made 390fps on average (not 360fps as you mentioned). This may be due to the weight or type of pellets that we were using, or it may be down to the gun - the point is we can only test what is put in front of us.
    Have you actually put your gun over a chronograph? If so could you give us the actual readings if you still have them and the name of the pellet used.
    Regarding being banned for sale, we are checking with UK bases Umarex suppliers.

    As for using it for pest control - although you are happy wth it - we would still regard the model we tested as unsuitable.

    Comment by: Pat Farey     Posted on: 28 Mar 2011 at 02:24 PM

  • Agree with your comments ref pellet weight playing a large part,I was using Target pellets,I am also using manufacturers and dealer specs.On testing with lightweight penatrating pellets the STORM went straight through a quality street tin without much deviation on entry exit.I know this is not a technical test but as I mentioned I would only use it at close range,letting the prey come to the killing zone and range .I also won't take a shot unless it is a head shot as I don't use the semi-auto function unless I am making a double tap kill.Gun's vary and gas pressure fades with use along with tempreture.The right kind of pellet ,frequent cleaning and light oilling and napier oil on all pellets used may be the differencece.I treat my rifles and pistols as I did in the Army ,as my best friends and with regular care and maintannance.I will have it tested and pass on the results and hope not to be dissapointed.My Beretta 92s has a
    better velocity than you quote for the CX4 ,SO AM AS PUZZLED AS YOU ARE. Regards Richard Sharpe.

    Comment by: Richard Sharpe     Posted on: 29 Mar 2011 at 09:56 AM

  • Thanks for the info Richard - would be interested in the chrono results, and if possible could you include the brand and name of pellets (or just the weight will do) so that we can work out the energy level in ft/lbs. Interested in your comments on Napier pellet lube as several people have told us that they make a significant improvement to accuracy. We never noticed that on our test but did get better shot-to-shot consistency and a slightly higher power output.

    Comment by: Pat Farey     Posted on: 29 Mar 2011 at 01:32 PM

  • I recently bought one of these, why is it not fitted with a rifled barrel

    Comment by: Charles Cook     Posted on: 11 May 2011 at 11:53 PM

  • I have no idea why Umarex chose to use an unrifled barrel - perhaps they thought that as it would mainly be used for fast fire plinking, a rifle barrel wasn't required. Nevertheless I think the gun would be more accurate with one.

    Comment by: Pat Farey     Posted on: 12 May 2011 at 01:38 PM

  • Still setting up storm for chrono test to get best berfrmance and an presently trying to find someone who is able to rifle the barrel,as it has been done by someone ailready.If it helps and is cost effective I will post details.I will only do it when the warranty runs out in November but will post all info I find out before hand for those whose warranties have expired and are willing to chance the arm.I have just come into possesion of a mint Honda VT 500 EF 1987 SHAFT DRIVE 4 SROKE MOTORCYCLE and a Rescue Gerrnan Shepherd Dog and with number 4 and the last and superb wife and 6 Children,I have my hands full,but will do my best asp.Good Job I am a disabled Veteran or I wouldn't have time for my non human babies and loves lol.
    Richard Sharpe

    Comment by: Richard Sharpe     Posted on: 12 May 2011 at 01:58 PM

  • Good review! I tested my cx4 earlier this year and was getting in the region of 460fps with RWS super-h-points - but this was when the temperature was quite low (between 4-10 C) - and i later realised that the gas was running low. I intend to do another test now the weather is warmer (with a new CO2) and will post the results. I do remember that in the owners manual it did make mention of 2 different power versions available - check the manual and your serial number to see which you have. One thing that no-one has mentioned is a solution for the issue with positioning the scope. The base of the scope mount has 2 grub screws holding it to the "tunnel" underneath the scope; i removed these and inserted some washers as spacers (about 4-5mm is enough) which effectively lifted the scope higher on the mount so that it's movement was no longer fouled by the iron sight casings - this allows the scope to move the full length of the picatinny rail - so it's now possible to adjust it for perfect amount of eye relief. This also allows you to see through the "tunnel" under the scope so that you can use the iron sights too if you want. i also cut some extra bits out of the carry case so that the rifle will fit inside with the scope attached (makes life easier!) - if you do it right you can even use the plastic you cut out to make the speacers to raise the scope a few mm!. a hawke laser kit (£30) finishes things off - it has 2 sets of mounts - i used one set around the scope tube to hold the laser - the other set is ideal for holding a AA Maglite which can then be fitted to one of the front picatinny rails. One thing I do wish it had is a rifled barrel..........!

    Comment by: Taff     Posted on: 19 May 2011 at 07:10 PM

  • I have just crono tested my Cx4 with eley wasps and the first shot came out at 550fps then the next few shots power was lower, down to 480fps, it was averaging about 500fps overall, I am assuming power drop of is down to the CO2 cylinder cooling as more gas is released

    With reference to the unrifled barrel which is disappointing, has anyone tried .177 lead ball these may give better accuracy (will avoid pellet tumble) if they stay in the magazine that is, I am currently waiting for delivery of the Gamo .177 lead ball so I shall soon find out

    I have heard that it would not be legal in britain to have a true semi-auto air/co2 gun with a rifled barrel, that why there are no semi-auto 12flb pcp airguns on the british market, fx make one it sells well in America, they would definitely sell well here

    Comment by: Charles Cook     Posted on: 19 May 2011 at 11:09 PM

  • I think it's true that the more rapidly you fire then the greater the cooling effect on the CO2 which does bring the power down. to get more consitent results some people wait 5-10 seconds bewteen each shot (ie for chrono tests). I would like to know how the lead BB work - interesting idea! - please keep us all posted!
    i dont know the law in the uk regarding semi auto guns and rifling etc - but i had heard that early versions of the cx4 and the Crossman nightstalker were delivered with rifled barrels - dont know if this is true or not. i also read somewhere that a "true semi-auto" will automativally index the magazine so that the trigger action merely releases the propellant but with the cx4 the trigger action also rotates the magazine - so maybe this would make it not a "true semi-auto"? Maybe someone knows?? hopefully i will get chance to do some chrono testing this weekend - i will post results if so. i will also try to test the effect of cooling on rapid firing - and also whether the moderator causes any reduction in muzzle energy - better get some more gas stocked up!!

    Comment by: Taff     Posted on: 20 May 2011 at 12:26 PM

  • Re opower of different models:- This is from the manual:-
    Muzzle velocity (energy): up to 600 fps, 183 m/s (Model 2253005, 2253006, 2253008)
    up to 495 fps, 150 m/s (Model 2253007, 2253009)

    Comment by: Taff     Posted on: 20 May 2011 at 12:32 PM

  • I understand that to be legal in the UK a rifled gun cannot be left with ammunition 'in battery' (lined up with the breech) as part of the firing cycle. Apparentely the only exception to this are semi-auto .22 rimfire cartridge rifles which were a negoiated exclusion.

    Rifled CO2 pistols/rifles should be left with an empty chamber at the breech at end of the firing sequence. The act of pulling the trigger manually cycles the magazine to put a pellet or BB into battery - hence they are actually manually sequenced guns.

    Comment by: Pat Farey     Posted on: 22 May 2011 at 06:02 PM

  • i bought the storm from my local dealer last week and as far as he knows there are no legal issues
    in fact the gun was bought for my 10yr old son who wanted it because it looks cool
    its only used as a garden gun but we found it poweful enough for spinners and pop cans at 20 - 25yds
    as my son says its brill

    Comment by: dave maxwell     Posted on: 23 Jun 2011 at 11:19 PM

  • had no problems buying mine in leeds my son (10) loves it for its looks we only use it as a garden gun maximum 15 yds range and we find it adequate to demolish tin cans

    Comment by: dave maxwell     Posted on: 08 Jul 2011 at 11:19 PM

  • Could anyone tell me what the build quality is like on the Beretta Cx4 storm?
    As I've fallen in love with the look and idea of this gun and it's 30 round mag.
    Really good replica of the real steel, of which I'm a big fan.
    Kind regards,

    Comment by: David Glen     Posted on: 27 Feb 2012 at 09:23 PM

  • first class build quality feels like it could last forever

    Comment by: dave maxwell     Posted on: 05 Mar 2012 at 01:35 PM

  • Hi

    Can anyone tell me how the picatinny unit at the front fits ? I am looking at a CX4 without one and know I can buy a unit to fit but its not clear how it secures since on the rifle the wholes are not threaded ????

    Many thanks


    Comment by: Simon Hawkins     Posted on: 22 Mar 2012 at 12:07 AM

  • How can You tell the Model Number of the Beretta cx4 storm

    Comment by: Andy     Posted on: 13 Sep 2012 at 12:01 PM

  • I have a CX4 Storm and my chrono results are higher than most, I have an early gun whith a rifled barrel (these are legal just frowned upon im told. I have met RFDs who state they are ilegal though this is untrue) at 20 Deg C using 7.4gr Umarex smooth domed pellets I get around 640fps which equated to just under 7ft/lb 6.9 to be exact, althoughthe fps does drop with rapid fire but this is normal with the co2 cooling effect.

    Comment by: C Barker     Posted on: 12 Mar 2013 at 04:42 PM

  • Oh and before I forget I didnt like the red dot sight so I fitted a riser rail to it and a set of high mount and now my scope clears the iron sight and the eye relief is correct.

    Comment by: C Barker     Posted on: 12 Mar 2013 at 04:48 PM

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Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
Umarex Beretta Cx4 XT CO2 rifle
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