CZ Scorpion Barrel Cooler

Among the many upgrades for the CZ Scorpion Evo 3, some owners have acquired this barrel cooler. It is available on CZ’s online shop for $25. Click here to check it out. Now there are some hypothesis that this barrel cooler is designed for the select fire Scorpions. I am not sure how well this will work for Semi Auto Scorpions. Unless you intend on doing multiple mag dumps, I do not think this will do much. The other concern is the material that this barrel cooler is made of. It looks to be made of some cast metal.

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The “fins” look very thick and while it might do something, I am not sure it will do much.
Here is a photo of the Thermal Dissipator by JP Rifles. They take a CPU heat sink design and wrap it around an AR15 barrel.

heatsink

If you look at CPU heatsink designs, they have thin fins of aluminum to draw the heat away from the CPU. JP’s Thermal Dissipator looks like it does the same thing. Which is why I question the efficacy of the CZ barrel cooler.

However, since it is only $25 it doesn’t break the bank. Perhaps it can give one peace of mind? What are your thoughts?





Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at nicholas.c@staff.thefirearmblog.com


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  • Tommy

    Obviously made from Aluminum, which is what you want because of its high thermal conductivity. The fins are oriented up/down which is actually better for convective cooling than JP’s design because your barrel will be horizontal. The surface area is not as great as JP’s but it looks to be about 3x more than a bare barrel, so heat transfer will be much greater. Plus the added heat mass of the cooler. That said, 9mm is hardly a barrel burner so I think it’s mostly a gimmick.

    • Caffeinated

      My concern is that it doesn’t look like the cooler makes physical contact for good conductive heat transfer. There appears to be a gap between the cooler and the barrel’s outer surface. It seems like it would be more effective with good physical contact.

    • tts

      I like the idea of a barrel heatsink of this sort but I don’t know if the current implementations are really doing much. The problem I have with the JP heatsink and this one is the contact quality + TIM, if any, that it gets.

      I’m no engineer but I have DIY’d my own PC’s for years and I know if you don’t get excellent contact and have a quality TIM the heatsink will hardly do anything to pull heat off the CPU. A metal to metal contact, even a tight one, alone won’t do much good.

  • Rick O’Shay

    My thoughts are that this is probably going to increase heat retention and cause barrel warping. But I’m not a scientist in any fields relevant to this particular subject, nor am I an engineer.

  • Tim

    Looks like the rebar in my ditch. Nice. I’ll give you $5,000 for it.

    • Thadius814

      ?WINNER?!! ^^^ he gets it!^^^

  • TheNotoriousIUD
  • Steve

    I was one of six guys in the USA that got the first batch of these imported (via eBay, third-party seller) – they are cast aluminum and machined internally to match the step on the chamber area of the barrel.

    They are designed to be sandwiched between the hand guard and barrel step when the barrel nut/heat isolator are torqued into place; however this presents something of a design problem – the nut is torquing both the handguard against the receiver AND the cooler against the barrel… one of them will bottom out first and it *should* be the hand guard since the front sight needs to have a rigid mount. This, in turn, leads to the barrel cooler being freely moving against the barrel – it is a loose slip-fit and has about 0.5-1.0 mm of play, forward and back. If you tip the firearm up or down, it will make a little noise with the cooler installed!

    I left it installed as accuracy testing didn’t show any major downsides… but I’m well aware that it isn’t doing anything for me without having a select-fire weapon.

    • tts

      Yeah no way that thing will do much if any cooling if it has that much play. Heatsinks need to be on tight with some sort of TIM or thermal grease bridging the air gap and minor surface imperfections to be effective.

      You can do a simple practical demonstration of this with any PC. Just open it up and loosen the heatsink enough so that it wobbles and watch how poorly it’ll cool the CPU after you do that.

  • Malthrak

    The full auto select fire Scorpions do indeed have these installed.

    Not sure what all they do or how necessary they are, but none of the semiauto models Cz makes have these. My guess is that, unless youre doing 1200rpm mag dumps the way the A1 model can, this aluminum cooler isnt doing anything but adding weight.

  • noob

    The original “too expensive for the military” Thompson Submachinegun featured annular cooling fins at the hotspot just down from the chamber that were lathed into the barrel profile. Back then it took a skilled machinist to do that by hand for each barrel. Now CNC machining could probably do a fine job of it at a rate of a number of barrels a minute.

    Having the heatsink being part of the barrel would be an advantage in that you won’t have to fill the gap with that thermaltake silver paste we use on the interface between our computer CPUs and their heatsinks https://uploads.disquscdn.com/images/b9d71d472d529aacb25b3ea7304fa8a4fd3870d7cdcbb355738aa5a4c3a6c139.jpg

    • Steve

      This was a question I asked Laugo (original designer of the Scorpion). They do NOT use thermal paste (or any heat-transfer compound) on the select-fire models. The heat sink acts as more of a heat shield (for a while) than anything else.

      • Edeco

        I was wondering if there’d be conducting adhesive. Ultimately couldn’t picture it due to vibrations and all, unless there’s something that can take it from aerospace or the like.

        • tts

          You wouldn’t use a TIM, thermal grease, or thermal adhesive alone to hold it on. You would also have to secure it, either with clamps or screws of some sort, to make it work effectively as a heatsink.

      • tts

        If there is no thermal paste or TIM of some sort it’ll have hardly any heatsink like effects at all and would be pretty much useless weight from that perspective.

        As a heat shield it looks like it would work OK but that is just me eyeballing it. I have no idea how well it would work in that capacity.

  • DanGoodShot

    Anything on there is going to “help”. The real question is to what degree? Personally, probably do a good enough job for joe shmow on the range on a hot afternoon. But FA mag dumps, Not enough. Yes, I would agree that its cast and will probably crack from the first cold breeze.

    • Malthrak

      It’s included on the actual FA A1 models, and absent from the semiauto S1 models.

    • Steve

      The added weight isn’t noticeable and the main difference I’ve noticed in heat is that after 2-3 magazine dumps, it takes a while to feel the heat through the vents but it ultimately heats up all the same.

      It is cast, but mine certainly hasn’t cracked in Summer or Winter weather and I’ve taken it out 2-3 times a month for the last year or so.

  • guest

    Keep in mind that whatever metal that thing (and similar products) are made of, is most likely a different type of alloy than the barrel. If it is a “slip on” version, then it gets even worse – as it will expand in a different way than the barrel. Hence all the guns that do have some kind of cooling ribs, have those machined on the barrel rather than rely on a separate part. It is in other words equally stupid and equally unresearched and as much of a gimmick as carbon fiber covered barrels.
    Also very questionable are the actual gains here – added weight, and 1 times out of 1000 maybe possibly used on a FA weapon, which kinda costs about the same number more than the cooling device itself, so the new question is why add a non-mfg part.

    IMHO for the vast majority of users who do experience problems with heat, the best solution would be to have a weapon that is designed to have the barrel expand in a uniform way without warping. This is quite an investment into that specific R&D area, but at least it does not come at a price of added weight and complexity. And of all small arms mfg there very, very, few who actually do that. Come to think of it I know only one, maybe two, and I don’t think others do it because it is never much of a selling point unless the customers are from some military branch.

    • Steve

      The difference in thermal expansion is not something you will see a problem with between the barrel and cooler in this case – the temperatures required to close the (generous) gap would have both the barrel and cooler sitting as molten pools of liquid metal.

      This large gap is also why I mentioned in another comment that I had asked Laugo if they used a thermal compound or not. With the large air gap, the cooler functions more like a heat shroud.

      At one point I actually wondered if the purpose was to pull heat out from the chamber and distribute it more efficiently down the barrel…

  • Lee Enfield

    The primary purpose of this device is to hold a flashy red paint job.

  • TonysTake ✓ᵛᵉʳᶦᶠᶦᵉᵈ ᵀʳᵘᵐᵖ

    It may work (a little), but then how in the hell will I cook my BACON in the morning?

  • thatoneguythatsmells

    This has nothing to do with heat. This gets placed over the barrel. Holes drilled, put a can over it, integral suppressor. The end.

  • jaja

    CZ just lost alot of cool points.

  • How hard would it be to make something like the Lewis Gun’s venturi-based cooling system– where muzzle blast caused a vacuum at the muzzle end which drew air over the barrel back to front– that screwed onto standard muzzle threads and attached at the rear with clamps or set screws like an AR handguard?

    • tts

      I don’t think it would be hard, they can already do some very elaborate and large heatsinks for CPU’s and for fairly affordable prices too. Though in the PC business they can rely on volume sales to drive down costs.

      The bigger problem is what TIM (Thermal Interface Material) you could use. I have no idea what could hold up to the temps a hot barrel will reach after sustained firing. I believe most of the stuff out there only works up to 250-300C. After that it starts to boil off or rapidly drys out and then loses most or all its effectiveness.

      You might just end up having to solder or weld on a heatsink for to stay effective at higher temps reliably. It all sounds fairly expensive to do unfortunately. Nothing technically all that difficult to do though.

  • Ambassador Vader

    Looks like hollow rebar.

  • Dan

    Glad to see concrete anchors have become tactical.

  • RSG

    Barrel harmonics!!

  • RSG

    This is similar to the heat sink aluminum oversized barrel nut POF-USA has been using in their rifles. They are ahead of the game.

  • Realist

    The last pic shown looks to be influenced by the Lewis Gun…a quasi-radiator if you will.

  • That_one_guy

    Better invest in a few ounces of thermal-paste or there won’t be a big difference.
    Burp

  • Stephen Jakubowski

    reminds me of the heat sink on cz’s early semi-auto infantry rifle, the ZH-29. https://uploads.disquscdn.com/images/1eb896ec911d70ea45810d0f9fcdb2957f8607996e3d374bd036b58ce28dd140.jpg