Cowl Induction Muzzle Brake – Gen 1




Gen 1 Cowl Induction Muzzle Brake with matte black nitride coating. Includes shim set.

Features/Benefits –
• Our proprietary design allows for the most effective recoil reduction on most calibers (.223 up to .338)
• Recoil reduced by up to 65%
• Caliber specific brakes provide maximum performance
• Horizontal ports help to create a minimal ground signature to keep dirt and debris away from shooter
• Better on target and follow-up shots due to lack of rifle movement
• Rifle movement reduction allows for shooter to watch target penetration
• Flats are cut on the rear to allow the attachment to barrels with standard wrenches
• Matte black nitride coating standard, and Cerakote colors are available
• Includes shim set

6.5mm 5/8″-24 TPI
5.56mm/.223 1/2″-28 TPI
5.56mm/.223 5/8″-24 TPI
.300-.308 5/8″-24 TPI
.300-.308 9/16″-24 TPI
.338 5/8″-24 TPI
.338 M18x1.5


  • Weight: 0.42 lb.
  • Material: 4140 Alloy steel
  • Outer diameter 1.10”
  • Length: 2.88”
  • Shim thicknesses: 1-.002, 1-.003, 1-.004, 1-.008, 1-.010, 1-.015
  • Color: Black nitride. Cerakote colors are available for an additional $20.00 charge
  • Caliber and Thread Pitches Below:
6.5mm 5/8″-24 TPI
5.56mm/.223 1/2″-28 TPI
5.56mm/.223 5/8″-24 TPI
.300-.308 5/8″-24 TPI
.300-.308 9/16″-24 TPI
0.338 5/8″-24 TPI
0.338 M18x1.5



12 reviews for Cowl Induction Muzzle Brake – Gen 1

  1. 5 out of 5

    I put this on my 300 winmag, Night and day difference from the seekings brake I had on it. Shoots like a 22 now! Its unbelieving how much of a difference it made. The only down fall is the price, but in my opinion well worth it if you shoot alot. I will be buying more for other rifles I have.

  2. 5 out of 5

    I forgot how well it works until I bought another rifle without . just needs to find a catchy name like fat little * **** and you might see more of these brakes out in the field

  3. 1 out of 5

    I recently purchased one of these for my Bergara rifle. There is no way you can mount this with the ports being exactly on the horizontal plane. It came with six washers of 3 different thickness. I tried every possible combination and it never came out installed correctly. They really need a better design to align this so it will function right.

    • 0 out of 5

      We’re sorry the supplied shim set did not do the trick to properly clock the CIB for you. We realized this could become an issue for some, and have a new shim set available that will be sent to you and should fix the problem.

  4. 5 out of 5

    Great brake – great customer service. really brings down the recoil of the 338. i have other breaks and this is my favorite. very easy to install and great finish.

  5. 5 out of 5

    Great Brake – Have 4 of them BUT the shims provided do not allow you to time it. Need more various thickness shims!

    • 0 out of 5

      Jeff, we’ll send you out a set of our new shims that have a better variety of thicknesses and make it easier to clock the CIB properly. Please let us know how else we can help.

  6. 5 out of 5

    As others have noted, the shim set is a bit lacking, but I figured that I’d just use a peel washer. My biggest actual complaint is the printing on it. The large main part of the print is offset, giving the optical illusion that the muzzle break is not timed correctly even when it is. This has no affect on function and would not be a determining factor in me getting another one, but my OCD is still unhappy about it. Im still debating whether to install it with the logo down, to avoid this. Otherwise, it appears to be an excellent product.

    • 0 out of 5

      Thank you for bringing this to our attention. We are always looking for suggestions for improvement, and will review this on the next run of Gen 1 CIBs.

  7. 5 out of 5

    Bought this and put it on my 6 lb 300 Win mag. I did not have any of the shim issues the previous reviewers had my came with a complete set and the 3rd one I tried worked perfectly.
    took it to the range and it kicks less than my 10 lb AR-10. I am super impressed and really happy with it. Its worth the money for sure. its the best brake on the market that does not need to be gunsmith installed.

  8. 5 out of 5

    OK – Just installed my 5th brake on a 6.5 CM with the extra shim kit. Works like a charm! Now it takes 5 minutes to time and it is much easier. Thanks for the shims!

  9. 5 out of 5

    I have 4 of these brakes with 2 more on the way. Most brakes are of poor design and just don’t do much with recoil. This CIB truly offers one of the best reduction in felt recoil to the shooter.

  10. 5 out of 5

    The 6.5CM is not a heavy recoiler in my Savage 10 FCP-SR. Even so, looking to the future after having strong side shoulder surgery, I wanted to get a good muzzle brake. After extensive research, I settled on the ZRODELTA CIB in the subject caliber. By the time the Doc released me to shoot, I had received and test installed the brake. I received the old shim pack with mine and could not get it to time correctly. After speaking with Chris and getting the updated shim pack, I was able to properly install the CIB. Two months after surgery, the Doc released me to shoot. At the range, I first removed the brake just to see what it would be like without it. Not only was it uncomfortable, it hurt. I then installed the CIB and shot. What a difference! This thing reduced the recoil impulse so significantly, it went from being painful to shoot to very comfortable. Although I can’t measure it, I would be willing to bet the recoil impulse was reduce by at least 50%. OK, I am shooting again. But would the brake affect my accuracy? Absolutely not! This was a .25 MOA rifle before the surgery. It still is today, with the brake installed. BZ to everyone at ZRODELTA for making an effective brake that, at least for me, did not impact accuracy.

  11. 1 out of 5

    to Support:
    Thanks for responding to my problem with the shim set that came with my brake, but a month has passed by and I still haven’t received a new set of shims that you said I would be getting.

    • 0 out of 5

      Just saw your message and unfortunately this fell through the cracks. Chris is sending your shim set tomorrow.

  12. 5 out of 5

    Thank you for sending me a new shim pack. I have it aligned perfect now and it works great!

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