Gamo Swarm Fusion 10X Gen II air rifle: Part 1

by Tom Gaylord
Writing as B.B. Pelletier

Gamo Swarm Fusion
Gamo Swarm Fusion 10X repeating breakbarrel rifle.

This report covers:

  • What is it?
  • How do it know?
  • Cocking
  • How many pellets are left?
  • Custom Action Trigger (CAT)
  • Sights
  • Integrated silencer
  • Two-piece cocking link
  • Summary

Today I start a report on the Gamo Swarm Fusion 10X Gen II breakbarrel repeating spring-piston air rifle. Repeating spring-piston air rifles are coming back in force, and I have already reviewed the Gamo Swarm Maxxim for you two years ago. I didn’t find that rifle to be very accurate, but it did feed reliably and had a very nice light trigger. At this year’s SHOT Show I met Gamo VP of sales, Joe Syring, who talked to me at length about the rifle I am reporting on today. I got a good feeling from him that Gamo is really trying to meet the needs of the airgunning marketplace, and this is just one of the ways they are doing it.

What is it?

The Swarm Fusion 10X is a breakbarrel repeater that’s powered by Gamo’s own Inert Gas Technology (IGT) gas piston. It’s a spring-piston powerplant whose gas-powered spring is built into the piston as a unit. Now, there are a number of repeating spring-piston air rifles on the market these days. What makes this one different is its 10-shot rotary magazine is horizontal instead of vertical, allowing the repeating mechanism to have a lower profile. That design brings up a very important question. Can the pellet be fed reliably this way, when it has to be manipulated to feed into the breech? I certainly hope so!

The rifle I’m testing is a .177, but Gamo also offers it in a .22. Both rifles hold 10 pellets in their magazines.

You know that I don’t like to make comparisons between products. But I will make a small exception today. I have recently tested the new Umarex Synergis underlever repeater for you and found it to be relatively light to cock (for a gas spring), reliable and very accurate! It’s priced $110 less than this rifle and it delivers a lot of performance at that price. So this Swarm Fusion 10X has a lot of competition! Well, Gamo knows how to make airguns and I’m rooting for this one to deliver on all that it promises.

The rifle is adult-sized, at 45.7-inches long with a pull of 14-3/4-inches. So it feels man-sized. But the weight of just under 6 pounds is fantastic. Gamo has long been building lightweight spring-piston air rifles and this one fits right in their stable!

The stock is glass-filled polymer synthetic. The butt pad is Gamo’s Shock Wave Absorber (SWA) recoil pad. I will comment on the firing cycle more in the reports to come, but I did shoot the rifle today and it is smooth. It does not slap your face the way some gas pistons do.

How do it know?

There is an old joke my buddy Mac used to tell about a guy who was fascinated by a thermos that keeps hot drinks hot and cold drinks cold. He asked his friend, “How do it know?” That was how I felt about this loading system. How can it take a pellet that, at rest, is positioned 90 degrees perpendicular to the breech, and turn it to insert it perfectly without damage? That has long been the bane of repeating spring-piston pellet guns.

I photographed it for you. As the rifle is broken open to cock, the entire magazine and the mechanism that holds it rotates up and turns 90 degrees, to align with the breech. As it does, a pin pushes the pellet out of the mag and into the breech. It’s a complex mechanism that Gamo seems to have perfected.

Swarm mag closed
The 10-shot magazine sits flush with the receiver when the barrel is closed.

Swarm barrel open
Opening the barrel just a little causes the magazine mechanism to turn the mag 90 degrees for loading.

One last thing — the mag can be loaded without removing it from the rifle. That means you can top it off at any time, and change pellet types when you do. Shooting single shots is simple — just put one pellet into the mag and cock the rifle! Done!

Cocking

Today isn’t the test for cocking but I just had to shoot it a couple times! This rifle cocks so easily! I’m put in mind of Sig’s ASP20 with this one! The secret to the light cocking with the power Gamo advertises (1,300 f.p.s. with lead-free Gamo PBA pellets and I will guess around 1,100 f.p.s. with lightweight lead) is how far the piston travels. That can be seen when the barrel is fully broken open.

Swarm cocked
See how far back the barrel comes to cock the rifle? This is for the operation of the pellet-loading mechanism as well as to cock the gas piston that has an extra-long stroke.

Two-piece cocking link

Beside the long piston stroke, the cocking link is articulated, so the cocking slot in the stock doesn’t have to be as long as the long piston stroke would usually require. That makes the stock more rigid which in turn helps dampen the vibration when it shoots. I will say a lot more about the shot cycle in Part 2.

How many pellets are left?

With a repeater like this you can cock and fire the rifle without a pellet being fed — what we call dry-firing. Gamo has made the magazine with a window in the back to tell you how many pellets remain. The number in the window indicates how many pellets remain inside the magazine. So if you see the number 3, it means there are 3 more pellets in the mag.

Swarm Fusion mag loaded
The three indicates there are three more pellets in the magazine that can be loaded into the barrel.

If no more pellets remain in the mag a warning triangle (international warning) appears in the window. There are now no more pellets in the magazine. However, if you just cocked the rifle there may be one in the barrel. I say “may” because if you haven’t been watching the mag window you may have already fired a dry shot and the barrel may be empty.

Swarm Fusion mag empty
When there are no more pellets in the magazine this international warning symbol appears in the window.

One last thing about the mag. It does not interchange with the standup magazine for the Gamo 10X rifle. That one stands up vertically and works differently. For this Swarm Fusion 10X you need the mag that lays down.

Custom Action Trigger (CAT)

Another feature Gamo has put on the Swarm Fusion 10X Gen II, to better position the rifle in the marketplace, is offering it with their Custom Action Trigger (CAT). Back in the day, and I’m talking 40+ years ago, Gamo triggers came out of the box very heavy and wore in to a light, smooth pull. Then, during the ’90s their triggers weren’t so good. But just after the turn of the new millennium they got a lot better, and this CAT is an example of that. Today is not the day for testing the trigger, either, but when I do it’s going to come out good!

One really nice feature of the CAT is that the safety doesn’t set when the rifle is cocked! The lawyers have listened and the rifle requires the shooter to know what’s going on.

Sights

The Swarm Fusion comes with open sights installed. They are fiberoptic front and rear, and their presence, plus the lower profile of the magazine, gives the shooter the opportunity to shoot with them if he wants. They are fully adjustable with soft (non-audible) detents. I plan to test them for you.

This rifle also comes bundled with a 3-9X40 Gamo scope and mounts. They install on what Gamo calls a Recoil Reducing Rail (RRR). It’s an 11mm airgun dovetail rail that puts me in mind of the very similar rails some BSA spring rifles have. Of course Gamo now owns BSA, so no surprise there.

Integrated silencer

The Swarm Fusion 10X has a Whisper Fusion silencer integrated into its polymer-jacketed steel barrel. It’s wide enough to give a good handhold for cocking and looking inside I can see what appear to be either one large baffle or perhaps a cup to reflect the pressurized air. Because this is a spring gun most of the sound is generated by the powerplant and not by the pellet exiting the barrel, but I have no doubt this silencer works.

Summary

I have to say — so far I am impressed. The Swarm Fusion 10X is lightweight, powerful, smooth-shooting, relatively quiet and doesn’t vibrate much at all. I like the trigger and I’m looking forward to really testing it.

I know this rifle is priced a little higher than some others, but it’s a repeater with a nice trigger. If it’s also accurate, Gamo has a world-beater on their hands!

60 thoughts on “Gamo Swarm Fusion 10X Gen II air rifle: Part 1

  1. B.B.,

    When you showed how long the stroke of the Gamo was it put my rememberer into gear. Wasn’t that long stroke also responsible for the velocity from the FWB 124? I don’t recall a single picture in the Sig ASP 20 in your series showing how long the stroke was in the gun. I’m thinking this Gamo Swarm Fusion may have a long stroke with smaller diameter piston requiring less pressure on the gas spring to produce the power resulting in a lower cocking effort.

    Siraniko



  2. B.B.,

    Well,.. this loading mechanism certainly is,…. interesting.

    Does Gamo somehow think this is better in some way,.. or,.. were they forced into thinking “outside the box” to avoid patent infringements of other types of loading mechanisms?

    Looking forwards to the overall review.

    Good Day to you and to all,……… Chris


  3. BB,

    In the looks department, this thing makes me shiver. Now there is a saying, “Beauty is what Beauty does.”

    I am glad to hear that the CAT trigger is worth having. It shows that Gamo is listening and willing to invest to gain market share. Maybe TCFKAC should take a clue.

    Is the front sight easily removeable?

    Spell Check: Last line in Integrated Silencer. …powerplant and not by the pellet exciting (exiting) the barrel…


  4. B.B.

    ” Well, Gamo knows how to make airguns and I’m rooting for this one to deliver on all that it promises.”
    My only experience with Gamo was a piece of junk, and the pellets re not much better. What is the greatest Gamo of all time?
    Maybe a Friday blog about it?

    -Y


  5. I have a standard break barrel single shot very much the same as this gun long stroke NP and the CAT trigger mine in .22. Most of you know about these guns. I don’t impulse buy much but found mine under half price clearance at a box store that was just changing inventory, still not a gun i would have chosen otherwise.

    It all came down to an interest in the CAT trigger as triggers are kind of my thing plus i have a real love hate thing with Gamo rifles & triggers over time. The CAT trigger stock adjusted is the only stock Gamo trigger i have ever been ok with. So for those of you who don’t know you can replace the stock 2nd stage screw thats about 6mm with an M2.5x10mm i sand and polish the end, BUT KEEP IN MIND BY DOING THIS YOU CAN ABSOLUTELY MAKE IT UNSAFE! So if you do this you have to take a rubber mallet or bounce test it. I got mine feeling like 1.5lb and safe. Do you need to take the trigger pull down that far i would say not however the gun is very light weight and it helps me keep on target.

    I am a big fan of the CAT trigger.


    • I did that same modification to a Gamo Silent Cat and ended up bending the barrel. Needless to say, I’m not a fan of Gamo air rifles. A friend has a Gamo Urban and I might consider that if it was in 177 and had a higher shot count. You only get 20 shots from the .22 and then you have to air it up again. Not my idea of fun.

      Brent



      • Yes well i did say you have to be careful and having some experience doing that kind of work or at least think about the likely outcome of the adjustment you are making. Look i am not trying to throw shade here. You never take an adjustment to a trigger stock or otherwise lightly. So you learned, but don’t blame the gun. The method can vary slightly gun to gun start with heavy trigger cocked and pointed in safe direction and crank screw in until gun fires then depending on gun back it out say a turn and a half or two, cock load and point in a safe direction and smack the butt hard with a rubber mallet rinse & repeat with 1/8 turn adjustments and when the mallet makes it fire back it off at least a quarter turn. This is also predicated on you having given the contact surface of the new screw sanding and polishing the surface as they often are not stock that way and a rough or set screw surface would yield unpredictable movement not to mention against a hardened surface or a soft one the screw will possibly destroy it.

        I cannot stress enough how ANY trigger work undertaken will be dangerous especially any internal modifications as you need an understanding of the metallurgy involved and it can literally be a game of .001″ or even less and some triggers are just plain cheap and sloppy to try and improve.

        I do get your frustration that was likely the end of that gun and one of the downsides for so much plastic. I would have gone with a Gamo urban if it were not for it not being regulated or coming in a .25 .

        I suppose to protect myself here i should just state for the record that you should buy the trigger you want and never under any circumstances do any trigger work and that all of my statements were meant to be pure supposition.


        • Well, you don’t learn except by doing and for a lot of us who can’t afford a gun with a match grade trigger unless we stumble into a great deal, the closest that we can get is to polish with steel wool, apply a little Moly and install a longer adjustment screw. It doesn’t help that Gamo has one of the skinniest barrels I’ve ever seen under their plastic shroud. I’m just blessed that I found my R-1 with its great Record trigger that doesn’t need any monkeying with in a pawnshop.


        • Brent & Mike,
          First off, Brent, I too experienced a bent barrel. Mine was a Crosman Nitro Venom in .22 caliber. Everyone knows how terrible the Crosman breakbarrel triggers are. I replaced the trigger with a Charliedatuna GRIII trigger. When I cocked the barrel the first time after replacing the trigger, the barrel snapped shut before I could load a pellet. Yup, on the next shot the POI was 6″ high at 10 yards. The barrel was bent. I returned that rifle and it was replaced with another Crosman Nitro Venom with another lousy trigger. So, I proceeded to replace the trigger in this one with the GRTIII trigger. This time I was very careful to not allow any sudden barrel snap shut. Strangely, this time the GRTIII trigger was fine and worked great in this rifle. I still have the Crosman, though do not shoot it anymore.
          In the spring of 2018 I purchased a Gamo Urban PCP .22 caliber. It shot great but had a lot of trigger creep. I bought some 2mm x 10mm long screws and filed one down to 9mm length. That eliminated the creep totally and now the trigger breaks very nicely and crisp. So the “lawyer” trigger on the Urban is very easily fixed, making it a very nice trigger. It’s as nice as the TO6 trigger on my Diana RWS. The Urban has been a perfect PCP for me and it’s amazingly accurate. I normally shoot two magazines of 10 shots and then refill with a hand pump which takes 50 pumps to bring it from 2000 psi to 3000 psi. It will shoot 30 shots well from 3000 down to 1500 but then takes a lot more pumps with the hand pump. 40-50 shots per session is good for me and three fills with the hand pump is enough exercise too.
          Geo


      • Brent,
        I did research on the Gamo Urban before I purchased one. Basically, it is a rebranded BSA Buccaneer made in Birmingham, England. It has the same hammer forged barrel and is of high quality. Above all, it is very accurate. I have not shot my Urban at longer ranges but I did test it at 30 yards. I was able to shoot a group in which 28 out of 30 shots were .42 to .50″. I’ve dispatched many starlings and sparrows and two woodchucks with the Urban.
        Geo


  6. B.B.

    To me the whole beauty of a break-barrel is its simplicity and these repeaters kinda fly in the face of that.

    Still, handling (tiny) .177 pellets with stiff fingers on a cold morning would really make you appreciate a repeater eh?

    Hank


    • Hank,

      This is where I break out the PCP. If I want a quick follow up shot, I do not need to be doing semaphore to let the game know where I am.

      Oh, by the way. I do not know about this one, but the Maxxim assembly can be removed from it and the air rifle will then function as a normal break barrel.


  7. Morning B.B.,
    On some rifles, not all, Gamo uses an all-polymer breech block and the pivot bolt is GLUED IN so you can’t adjust it when the barrel has side-to-side wobble. If you can’t adjust such an important part of the rifle, then the rifle will permanently lose its accuracy and will no longer be interesting to use. No more Gamo springers with polymer in place of steel for me.
    Regards,
    Will


  8. I think the Umarex took the right approach on this one but time will tell. I could see this for bagging bushy tails.
    They jump from tree to tree and if they know you are trouble, they will be quick about it. A problem in search of a solution, but I would say look at how a company like Shimano does small parts and mechnisms, very reliable and durable. The gear shifters and stuff survive many crashes but I dont get that feeling of confidance with this Gamo device. Single shot guns are single shots guns for a reason. If you need a quick follow up shot, get a fast cycling PCP, however, this rifle cost more than the Umarex, so I wonder about this products life cycle. It needs to be a good shooter..
    The WAR valve poppet wouldn’t seal after modding it and I was bumming. Luckily, more preload on the valve spring, and it seals up fine now..25 Mrod, 8 shots, hits like a small truck, and it is the most accurate gun I own,
    but, at a nickel a shot a bit spendy for plinking.
    Best,
    Rob


  9. About a year ago I found a Gamo Big Cat 800 in 25 caliber for $114 delivered. Online rumor had it that it used a BSA barrel (based on the breech seal being on the cylinder side vs barrel breech), so I decided to go ahead and get one on a lark. It has an acceptable trigger and turned out to love H&N Spitzkugel 24.85 pellets. Nice and accurate, not too hold sensitive, shooting in the low 500s for velocity. Really needs a mildot scope and a dope sheet to shoot at various ranges though lol…



    • MMCM13,

      You are one of the very few people who sings any kind of praise for Gamo sproingers. My Gamo CFX was a love/hate relationship. If it had been the wood stocked .22 I would probably still have it, especially since I have learned more about triggers and such.

      I do however have a very hard time even considering buying a Gamo sproinger now that I have been spoiled over the years. These days I would be tempted to jerk the trigger assembly out and replace it with a single stage trigger. Despite what some may think, they can be nice.


      • Not so much praise as surprise. I didn’t expect much from it, but the allure of maybe a BSA quality barrel drew me in. I have springers from 17 to 30 cal now, this one is the 25. Accuracy was “acceptable” and twang wasn’t too bad, until a serendipitous arrival of a few cans of pellets from AoA, a mixup, I didn’t order anything but a mixup sent them anyway, including the H&N spitzkugels in 25. The rest is history now. This model has a supposedly improved Gamo trigger in it, but having never shot an infamous(?) Gamo trigger, I can’t say if it is a leap ahead. My love-hate relationship has been with Hatsan (Dominator, mechanical ills) and Walther (Parrus, hates all pellets).
        Still debating on the wisdom of looking for a sproinger in 20 cal now, the one I lack…


  10. A blog about Gamo. Interesting. Does Gamo still own BSA? I know at one time Gamo was using BSA parts in their production of new Gamo’s. The Gamo 400 evolved from the BSA Meteor as I recall.

    As RR stated the CFX was highly touted. The Gamo Hunter 440 was also popular and also sold as a Daisy 1000 and a Savage 1000G. I received a Savage 1000G in a trade and it shot well. Terrible trigger.


  11. Just a little more about PA shipping. My package was promised by tomorrow and it was delivered today. If it had not been for Thanksgiving I probably would have gotten it Saturday.


    • RR,

      I’ve been severely tempted by PA’s Black Friday sale to get another price point PCP (read Gauntlet) but I really need to continue working on and shooting my Euro Maximus and detuned R1. I was able to shoot 25/60 at the state FT championships in piston HFT with the R1 and we had an insanely hard course and tricky winds. I think both guns have the potential to shoot 35-40/60 if the shooter gets better.

      Brent


  12. B.B. looking forward to this review and to Friday’s too! I totally see the point in a repeating spring rifle. The point in “repeating” :). Same with a .22 single shot bolt and a Mag fed 22 bolt. I hope this one is accurate. I personally lean toward this one over the Umarex Synergis due to the fact that the Gamo is almost 3 lbs lighter and it has open sights!!! Love having that option.

    Doc




  13. B.B.,

    Only one more test item needed for this hunter for me…throw it into the mud and then an operational check…. OKAY, okay, perhaps just throw a little potting mix at the magazine and breech area.

    shootski




  14. I bought a Gamo Shadow 1000 in 2003. No idea of what it was other than a pellet gun that I hoped would be useful for tree rats. It vibrated and buzzed badly and was no fun to shoot, so I only used it when I couldn’t use a .22- so it mostly sat unused. Fast forward almost 14 years and after a simple light application of grease on the spring and a CDT trigger, it’s a very nice shooter. Don’t really care what the “book” on them is- I like it just fine, now.


  15. I kind of blow off any repeating guns. I really prefer single shots. If forces me to slow down and enjoy every shot. But, I have to admit that I enjoy my old El Gamo Survival Rifle that was made in Brazil and it has about a 22 or 23 shot tube repeating mechanism that works slick as a whistle. And, the little rifle has a light enough cocking stroke that it is fun to shoot it shot after shot.
    David Enoch


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