CZ Scorpion EVO3 Reduced Weight Trigger Spring Kit

Rated 4.97 out of 5 based on 62 customer ratings
(62 customer reviews)


SKU: 10048 Categories: ,


Our spring kit provides a 5.5lb trigger pull (down from 9.0+ lbs factory trigger). Simply remove your factory trigger and disconnector springs (#63 and #50 respectively on the factory parts diagram) and replace them with our application specific trigger and disconnector springs. Both springs in our kit must be used together. Gunsmith installation is recommended, but not required.

TIP: Many customers opt to also deburr and polish the working surfaces of the trigger components while replacing these springs; doing so will typically result in an even lower trigger pull weight and smoother trigger operation.

  • Provides 5.5lb Trigger Pull
  • Fits CZ Scorpion EVO3 Pistol and Carbine
  • Includes (1) Trigger Spring, (1) Disconnector Spring, and (1) Firing Pin Safety Shim

Designed and Manufactured completely in USA.

Gunsmith Installation Recommended for All Parts.

*Please note that for 2016 Scorpion S1 models (pistol/carbine) there is a high rate of welded trigger packs. The retaining weld should be identified and removed prior to any trigger pack work. For more information on removing the weld please see our info here: Scorpion Trigger Pack Weld



62 reviews for CZ Scorpion EVO3 Reduced Weight Trigger Spring Kit

  1. Rated 5 out of 5

    Loretto Efre

    I got the scorpion for my 41st birthday. I was in between the sig MPX and the scorpion. A lot of factors weighed in for me, the overall price of the weapon, the price and availability of extra magazines, the ability to suppress it, availability for aftermarket parts. I chose the scorpion thinking the one thing I really don’t like is the trigger. I figured like most weapons a break in period would be required but after finding out that this weapon system is basically set up for select fire in the trigger pull weight is not something that will be broken down I was about to sell the scorpion until I found HB online. I ordered a spring kit which arrived quickly, it took me a while to replace the spring kit not because of the complexity but because of my disease multiple sclerosis. After installing it and dry firing it I falling in love with the scorpion. For $12 HB has fixed what CZ not only overlooked but for people like me probably cost them a sale. Getting this spring kit will make you enjoy firing this weapon.

  2. Rated 5 out of 5


    This with a bit of polishing of the contact surfaces made a huge difference to the action. Now it feels much smoother and faster while still igniting milspec primers. The springs were pretty fiddly to install along with the 922 parts but overall not a challenge.

  3. Rated 5 out of 5

    Andy C.

    Essentially takes the trigger pull from 9+ pounds down to about 5.75 pounds. Don’t quote me on the exact poundage, but it is a drastic improvement over the stock springs. If the pull on the stock trigger is like trying to turn the wheel of a parked car without power steering, this kit just smooths everything out and makes this weapon easier (and faster) to cycle. Probably one of the cheapest/best initial upgrades you can do to the CZ Scorpion.

  4. Rated 5 out of 5

    Jason (verified owner)

    Easy to install. Also polished the contacts on the trigger parts that took only five minutes and had a constant trigger pull of 5lbs. Awesome. Thanks

  5. Rated 5 out of 5

    Steven B. (verified owner)

    Just picked my Scorpion up from the gunsmith today. Could not be more pleased with this trigger. I can’t believe the difference it made over the stock trigger. This and their AK style safety delete are day 1 must upgrades for anybody who owns one of these fine weapons. Spend the money you will not be disappointed!

  6. Rated 5 out of 5

    J. Valerio (verified owner)

    Great trigger upgrade, lightens the trigger pull from approx. 9 LBS to around 5 +/- LBS , easy to install!

  7. Rated 5 out of 5

    Steven Adkins (verified owner)

    Easy & fast install on both springs. Cut trigger pull weight by half! Mega good product for cost & what it does!

  8. Rated 5 out of 5


    makes the evo’s trigger so much better. highly suggested!

  9. Rated 5 out of 5


    If you want to cut your trigger pull weight significantly for a reasonable price, this is for you!!! Easily installed and quite satisfying results!!!!

  10. Rated 5 out of 5

    Jeremy (verified owner)

    We all know the stock trigger on the Evo leaves a lot to be desired. This replacement spring kit seems to solve most of the problem. My Scorpion had a 10lb + pull weigt on it, and after installing this kit with a bit of internal polishing, it dropped to a consistant 4.5lbs. I also installed one of HBI’s flat faced triggers and the two combined create a more enjoyable shooting experiance. Because of the the HBI upgrades, I was able to improve the way I shot and saw an increase in my accuracy. This is a must for any Evo III

  11. Rated 5 out of 5

    Chip (verified owner)

    I snagged a used EVO 3 on impulse buy at my LGS – heard a lot of good things about them. Matching the interwebz information, the one I got had a crazy heavy trigger pull and the ambi safety digging into my hand was none too pleasant either. Instead of bailing on this impulse buy, I thought I’d give this a try and as others have stated this is night/day improvement over stock springs. With these 2 small springs replaced, the trigger is much more like the other sub gun knock-offs I have and very pleasant to shoot.

    Installation is straight forward, but if you’ve never swapped out an AR or AK trigger group (as a starting point) you may want to pick up a half rack of beer for your part-time at-home “gunsmith” friend to help out. The video posted on youtube is well done and you can mostly figure out what to do here. The one thing I found – getting the long spring set under the front bar is a PITA and a non-starter with a flat screwdriver as the video showed. Use something to capture the spring completely (I used a roll pin starter from my AR build tools) so you can easily draw it down to the bottom of the trigger box.

    If you are still running the stock trigger, buy and install one of these – you won’t regret it!

  12. Rated 5 out of 5

    Justin (verified owner)

    Really love Geissele triggers and wished they made one for the scorpion. Took a chance and ordered this kit along with the DELTA trigger. I now get consistent 5.5lb pulls. It was really what the scorpion needed and is working great. Shipping was fast and the install was not difficult. If you can build an AR lower, you can install this kit.

  13. Rated 5 out of 5

    Clint (verified owner)

    After shooting my Scorpion for nearly a year, the trigger had lightened up some already, so adding this spring kit to my order for the AR style safety was something of an afterthought. I figured it might lighten up some, but wasn’t expecting a night and day difference.

    Watching the how to on YouTube, I installed the springs along with the safety and safety delete. For good measure, I did a little polishing too.

    Got everything back together and wow! So much lighter and I swear the pull and reset are shorter. Best $8 you could hope to spend on your Scorpion without a doubt. I don’t have a pull gauge, but it’s easier to pull than my CZ Duty in double action mode and lighter than the XD 45 I have as well. Buy this now!

  14. Rated 5 out of 5

    Adam (verified owner)

    This spring kit is like magic. Such a good investment. Seriously adds to the experience shooting the gun.

  15. Rated 5 out of 5

    Brad (verified owner)

    Worth every penny. Easy to install (took a 20 minutes with youtube in the background) and the trigger is so much nicer. I consider this a necessary upgrade.

    Great product!

  16. Rated 5 out of 5

    Douglas Henry (verified owner)

    Hands down the best $9 you SHOULD spend on your evo. Before these Springs and the forward set trigger the pull was over what my gauge registers (9+ lbs) after the upgrade the pull is around 6lbs with a short positive reset. Well worth it!

  17. Rated 5 out of 5

    Jason B (verified owner)

    Great product and a excellent price. Dropped my trigger pull to 5lbs

  18. Rated 5 out of 5

    Randall (verified owner)

    Wow. That one word could be the review in itself, there isn’t much to be said that hasn’t been said in previous reviews. This simple upgrade makes the Scorpion feel like a completely different gun. If you’ve got the confidence and the materials laying around, do a nice trigger polishing job while it is disassembled and you’ll be feeling you paid $300 for this trigger upgrade. HB has created a lifelong loyal customer in me, thank you

  19. Rated 5 out of 5

    Paul (verified owner)

    Another simple upgrade that is reasonably priced and was promptly delivered.
    Installation was simple once you manage to get all the bits lined up.
    Along with the HB Delta trigger and AK selector transforms this firearm is a good way.

  20. Rated 5 out of 5

    Cullen (verified owner)

    Completely changed the feel of the trigger. Way lighter than stock, a must do modification. Also purchased the right safety delete, another absolutely necessary item. First time on the range with the scorpion without that and the gun cut my finger open!

  21. Rated 5 out of 5

    Roy Kelp (verified owner)

    big improvement , well worth the 1/2 hr or so it takes , [ watching tv and the install video ] used my dremell to take the weld off my mounting bolt , can’t wait to shoot

  22. Rated 5 out of 5

    Mark K (verified owner)

    Probably the single best improvement at the lowest cost that can be made on the gun. I’d make it the first mod on the gun, even before shooting it.

    If y’all could also magically take away the trigger creep, that would be even better!

  23. Rated 5 out of 5

    Ohio Fun and Gun (verified owner)

    Wow, what an absolute improvement to the trigger. For the little time and little money it takes for install, these springs area no brainer improvement for your EVO. If you follow the HBI video, you will have a much smoother shooting EVO in less than 10 minutes. I am still astonished that it’s as good as it is now w/o having to buy an expensive trigger kit like you would have to for AR’s and other firearms. The trigger now goes a consistent feedback right up to a crisp break. No gritty creep too. It just feels like a different gun. It’s crazy that CZ didn’t figure that out in the 1st place.

  24. Rated 3 out of 5

    Sean Myhre (verified owner)

    The replacement trigger spring has a slightly larger diameter curve in it and is a thinner diameter wire. Combined, these two dimensions cause excess room in between the trigger case and the trigger housing. This extra room allows lateral movement and can cause the spring to walk off of the block lever leg. If this happens, the trigger is no longer functional until it is reinstalled. I put a washer next to the spring to tighten the fit into the housing and added a small notch to the block lever leg to help retain the spring. We will see if this resolves the issue. When the spring is operational, I was getting a 5.5lb trigger pull, much better than the factory.

  25. Rated 5 out of 5

    Patrick (verified owner)

    Definitely provided a consistent 5.5lb trigger pull. A great improvement and definitely a must have.

  26. Rated 5 out of 5

    Tim K. (verified owner)

    Excellent video on how to install! And it made a great improvement on the trigger. Mine was welded and I didn’t order the drill kit since I have a garage full of drill bits. But like they say, it is a tough weld and mine went almost to the dang trigger housing. So I would recommend the trigger weld drill kit if you are in a hurry at all.

    I have bought a few things from HBI and will certainly buy more. A great outfit with great designs. And great videos on how to DIY to boot!

  27. Rated 5 out of 5


    This spring kit is a must have on your CZ Scorpion Evo. All most no effort on pulling the trigger.

  28. Rated 5 out of 5

    Nate O’Brien (verified owner)

    Like the other reviewers, I’ve found that, for 8 bucks, you feel like you literally have a different weapon. The experience is so much better… not only lighter, but I took the opportunity to remove the factory CZ CLP, reapply a light coat of Breakfree CLP, and finally, a layer of Slide Glide to the mating surfaces…and holy sh*t, I now know what a custom trigger feels like- No grind, light, consistent pull… lovely, really… and all for 30 minutes of my time and 8 dollars.

    HBI is *the* company for EVO upgrades. I can’t speak highly enough about their quality, tutorials, and service. Other companies should be taking notes.

  29. Rated 5 out of 5

    Robert DeFrancesco (verified owner)

    Way better trigger pull with the reduced weight springs. Having a world legal scorpion makes it more difficult, but not impossible, to install. I would recommend this to anyone with a scorpion!
    P.S. HB customer service is excellent.

  30. Rated 5 out of 5

    Ruud (verified owner)

    This Reduced Weight Trigger Spring Kit feels WOW, this is a musthave for all EVO 3’s out there. Thanks HBIndustries.

  31. Rated 5 out of 5


    I little trick to instal, due to the way the scorpion is designed, but worth every penny once it is installed. Worth every penny. A MUST HAVE upgrade for any scorpion, along with the right side safety delete and the trigger hardware pack refresh kit.

  32. Rated 5 out of 5

    John Grimes (verified owner)

    Simple install especially thanks to the video. Far lighter pull than the stock trigger. Half the weight at least and it feels smoother too.

  33. Rated 5 out of 5

    Steve Kidder

    I ordered the mini AK style selector a black trigger and the trigger springs. The Scorpion is a good gun, but not great out of the box. That being said, it should have come stock with all of these improvements. With these installed the gun is now better than great. It’s amazing!!! I own a lot of guns but this is for sure my favorite. Shooting it suppressed gets the Scorpion very dirty, but it cleans up nice. These all look like factory installed parts, and the videos are top notch when installing these. Great company. I will be buying more.

  34. Rated 5 out of 5

    Johnny (verified owner)

    Love this thing. Best $10 I ever spent.

  35. Rated 5 out of 5

    Lee (verified owner)

    Fantastic replacement parts. Took me awhile to install due to the fact that my trigger pack and lower receiver was weilded ( look up HB instructions to remove ). Polished trigger parts and installed springs, now have exactly 4.5 pounds of trigger pull.

  36. Rated 5 out of 5

    Fred Ferraro (verified owner)

    Installed the HB spring kit yesterday and 1) it was fairly easy following their online video (YouTube) for the install and 2) the trigger pull is half or less of the factory pull force. After about 150 rounds with the new trigger I found that I can concentrate more on my form and aim and not have to worry about pulling the gun with the stiff factory trigger. Very nice!

  37. Rated 5 out of 5

    William (verified owner)

    Are you kidding me? For the cost of these springs they’re an absolute no-brainer. I almost cheaped out and didn’t add them to my cart because I didn’t think my stock trigger was that bad. Wow. These made a huge difference in trigger weight. The CZ should come stock like this. Thanks to HBI for fixing the problem!

  38. Rated 5 out of 5

    David L

    This is the BEST $ you could EVER spend on your EVO. You will not be disappointed. Easy to install. Did I mention that this is the best $ you could spend on your CZ?

  39. Rated 5 out of 5

    Kenny H. (verified owner)

    Quite a difference!! Very pleased.

  40. Rated 5 out of 5

    Jessun (verified owner)

    This is the first thing any sport shooter should buy for their Scorpion. One little heads up: The trigger return spring installs only one way, as correctly they say in the video, but it can then assume two distinctively different positions depending on how it tilts around the pin.

    This goes for any spring in there, so not the fault of the product, but make sure the spring once installed looks exactly like in the video. If the long end has settled towards the wall and the short orange end is pushing towards the inside and the moving trigger floor, then the trigger will stick on release. I found out at the range…

    I thought I’d add this as I took to the dremel to polish the hammer surface to ease things up, which wasn’t necessary at all. OK for fine tuning perhaps but no use for user installation error.

    But again, buy this kit! I got the curved trigger from HB as well and the extended charger handle. Awesome kit, awesome service!

  41. Rated 5 out of 5

    mrstefanko1 (verified owner)

    Super easy and much better feel

  42. Rated 5 out of 5

    Stu S (verified owner)

    I agree with all the other posters: “BUY AND INSTALL THIS IMMEDIATELY!!!” Even if you haven’t even shot your new Evo yet. Just dry fire a few times. Installation can be tricky getting this spring under the firing pin block pivot arm. Watch their video a few times and use a vise to hold the trigger housing. I did it in a poorly lit garage without a vise! Wish I had a third hand. Results are spectacular! Not a Geiselle but excellent improvement. I think the factory uses the same trigger return springs for their A1’s so that would explain the heavier pull. BTW my new Evo (9/17) did not have a welded trigger housing screw!

  43. Rated 5 out of 5

    redortega (verified owner)

    This is a must have for Evo owners! I bought this spring kit, paired with a Delta trigger and polished up the contact surfaces of the trigger components. My trigger pull is now down to a nice, crisp 5.5lbs.

  44. Rated 5 out of 5

    Keith (verified owner)

    Wow. Better than advertised. HBI is THE got to place for the Scorpion EVO lll. I have had this spring set and a flat trigger replacement in there packages for at least 2 months. I really thought the stock trigger was not that bad and I didn’t really want to mess with the welded trigger pack spring. Finally at 3 am I couldn’t sleep. Got the dremel and after 1-2 minutes popped the welded screw out and thanks to HBI installation video I installed the springs and trigger. Kicking myself for waiting. Night and day difference. I have just over a consistent 4.0 lb trigger pull. I did not polish the internal just the spring kit and trigger. Cheap and super nice upgrade to your EVO lll.

  45. Rated 5 out of 5

    Michael (verified owner)

    So simple yet so effective. I watched the HBI YouTube video on how to install it while I did it. Great video and product for the money.

  46. Rated 5 out of 5

    Jack (verified owner)

    If you only do one upgrade to your CZ Scorpion this is the one to do. It gives you the most bang for your buck, easy to install and the trigger pull difference is instantly noticed. Just order it you will not be sorry, a must have item !

  47. Rated 5 out of 5

    Mason (verified owner)

    One of my favorite upgrades to my Scorpion. Pulling the OEM trigger and my Scorpion’s trigger with this new spring is a world of difference. Can’t say enough good things!

  48. Rated 5 out of 5

    dkg1026 (verified owner)

    I was ok with the stock trigger and spring but the HBI spring kit and Theta trigger are a game changer. Very thankful for the HBI installation video.

  49. Rated 5 out of 5

    Paul J (verified owner)

    I didn’t mind my stock spring. I put 400 rounds through the gun and was ok. I bought the spring kit while purchasing a larger charging handle. My talented friend put the spring kit in.
    It is a total difference. He is going to get one for his Scorpion too.
    Can’t recommend it enough!

  50. Rated 5 out of 5

    Davidmfannjr (verified owner)

    Just installed the trigger and for the price of this 5/5 deserved. Feel the difference and love it. Thanks!

  51. Rated 5 out of 5

    Steven Drawdy (verified owner)

    Huge improvement over the factory trigger, dropped my pull from almost 10lbs to just under 5. Instalation was simple, if you’ve messed with other fire control groups from ARs or AKs you’ll have no issues. I installed mine (non welded pack) in about 20 minutes with no vice and on my kitchen table. 5 stars!

  52. Rated 5 out of 5

    c4vette (verified owner)

    Great improvement smooth trigger pull and installation video was a great step by step help. I liked the idea of the wood dowel to depress the spring I even filed a tiny notch on the end of the wood tip to help the spring stay in the groove . I used a wood meat skewers I have for the grill. I also like the angle of your new trigger to go with the lighter springs.

  53. Rated 5 out of 5

    Tom (verified owner)

    This spring kit is an absolute must for any Evo owner. My trigger pull weight went from 9 1/2 lbs to 5 lb 2 oz consistently. I wouldn’t want it any less in this type firearm.
    I haven’t done a lot of trigger work, Glock, Ruger rim fires is all. If you follow the video, and have some mechanical ability you can change these springs.
    I had the tail of one spring in the wrong place, but when I asked a question of HBI Pat sent me a photo of how the springs should be when completed. Easy to see where the tail went, and put it there. Incredible Customer Service.
    I did not polish the internal parts. I don’t think it is needed. My completed trigger has some creep, but no grit. The spring kit alone lowering the trigger pull weight makes an incredible difference.

  54. Rated 5 out of 5

    wanderlust7 (verified owner)

    Big improvement over stock trigger conditions. Was easy to install (watched the You Tube video at same time). Didn’t do any polishing of parts but still made a big impact on trigger pull. Definitely would recommend.

  55. Rated 5 out of 5

    Kenneth R Noe (verified owner)

    Night and day difference between this and the factory trigger weight. Mine is at about 3.5lbs after installation of this spring and having the mating surfaces polished. Excellent product, excellent customer service, I highly recommend!!!

  56. Rated 5 out of 5

    Captdave (verified owner)

    I’ll give it a 10 out of 5!!! Works great and was easy to install for me after watching the video. Best upgrade for the dollar I ever spent.

  57. Rated 5 out of 5

    Carbon Addiction (verified owner)

    It made so much of a difference i thought i did something wrong.

  58. Rated 5 out of 5

    Greg (verified owner)

    Another great product from HB industries. The spring kit is a “must have”. It requires a bit of patience during installation. They have a video to walk you along. Once your done you’ll wonder how could you have ever been without it.

  59. Rated 5 out of 5

    brassaga (verified owner)

    combined with theta forward trigger, this makes a night and day difference!

  60. Rated 5 out of 5

    texasvoodu (verified owner)

    WOW drastic change to trigger pull !!!!!! A must have for your Scorpion!!!!!!

  61. Rated 5 out of 5

    Walt (verified owner)

    OUTSTANDING upgrade to my Scorpion carbine!!! It dropped the trigger pull weight down from 9 1/2 lbs to 5 3/4 lbs. Trigger now has a very smooth pull, nice break and good tactical reset. Easy installation, I followed the video while I installed the kit with a little third hand help from the wife. This upgrade is a must!!!

  62. Rated 5 out of 5

    tcapraro18 (verified owner)

    Bought this before I even picked up my scorpion. Felt the difference in dry fire and loved shooting it with this kit. A+

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