How to Install an Ultradyne Compensator

At Ultradyne USA, we are proud of our new line of firearms accessories. One of the most important aspects of getting the best results from your Ultradyne products is to ensure that they are set up properly.

Today, we are demonstrating how easy it is to get our C4 Dynamount Front Sight and the Apollo muzzle device installed correctly.

Before beginning installation, you will need to make sure you have all of the tools and parts handy. Check that you have the timing nut, the muzzle device and the Dynamount Front Sight. Also, decide if you’d like to mount your front sight in the standard or 45 degree offset configuration. For tightening, you will need a torque wrench and standard wrenches as detailed in the chart below. To double-check alignment, you can use a level as a reference after installation. For a more detailed information, please refer to the instructions here.

Device: Apollo 223 » Wrench Flat: 13/16 inch
Device: Apollo 308 » Wrench Flat: 13/16 inch
Device: Mercury 223 » Wrench Flat: 3/4 inch
Device: Athena 223 » Wrench Flat: 7/8 inch

Still have questions? We have answers! Reach out to us at with your questions and we’d be happy to help.

Thanks for choosing Ultradyne!

Learn how to install an Ultradyne compensator with the Dynamount Front Sight from our video:


  1. Jim on October 2, 2020 at 11:05 am

    How will a ULTRADYNE PEGASUS TANKER COMPENSATOR work on a 6mm ARC with 5/8-24 threads?

    I plan to add a muzzle brake on a 18” barrel for hunting and utility work.

    Suggestions are welcomed.

    • Gabe Denzine on October 15, 2020 at 8:02 am

      The bullet diameter is the same as a 6mm Rem and the pressure coming out of the shell is a little less. The performance and recoil reduction with that caliber will be great with the Pegasus. In a hunting scenario, the 90° ports won’t have any gas exhaust going back towards the shooter, but it will still be very loud.

  2. Scott on October 27, 2020 at 5:13 pm

    13/16 did not fit on my Apollo S. 7/16 worked up front and the timing nut was larger and I had to use an adjustable wrench to get it timed and installed.

    • MT on March 25, 2023 at 11:31 am

      I had the same issue, Very frustrating!!!!!!

  3. Jeffrey on December 8, 2020 at 7:18 am

    will I need to use a bore alignment gauge to install a compensator

    • Gabe Denzine on December 8, 2020 at 7:47 am

      Hey Jefferey, no you do not!

  4. Sam on January 7, 2021 at 7:03 pm

    13/16 wrench is too small. I went out and bought 2 like you mentioned in the video. Now I have to go back and figure out the right size. Please give correct information in your videos.

    • Gabe Denzine on January 8, 2021 at 7:52 am

      Hey Sam, The 13/16″ wrench fits perfectly on a 5.56 size compensator – as shown in the video.

  5. Brian on February 10, 2021 at 3:04 pm

    How do you know where correct timing position is?

    • Gabe Denzine on February 10, 2021 at 3:06 pm

      Hey Brian, the top of the compensator should be completely level with the side ports also running parallel to the ground and your hand guard.

  6. CARL on January 4, 2022 at 12:58 pm

    how do you know correct index position

  7. samppa on April 20, 2022 at 11:32 pm

    Is it ok to install the brake with crush washer instead of timing nut? I’m planning to use a blast shield and there’s no room for shrouded nut.

    • Thomas Jamison on April 22, 2022 at 1:40 pm

      Hey Samppa,
      Unless this is for an AK brake, you’ll need to use the timing nut. Feel free to reach out again if you are in need of more assistance.

  8. Tyler on February 3, 2023 at 10:37 am

    Will the 308 version work on my 300 SAUM with a 22″ barrel?

    • Parker Rothweiler on February 13, 2023 at 1:08 pm

      We would suggest that you use the 300 Caliber Apollo LR.

  9. JD on February 21, 2023 at 7:17 pm

    So no thread-locker needed?

    • Parker Rothweiler on March 7, 2023 at 9:02 am

      No thread locker needed.

  10. Mike on February 27, 2024 at 8:55 am

    Is the wrench flat for the 308 Athena the same as the 223? (7/8)

    • Blake Trickey on February 27, 2024 at 10:18 am

      Hi Mike! Thank you for reaching out to Ultradyne! Just as a heads up ( on this link, we list all the specs for the Athena. The Athena .308 has 1″ wrench flats, and the timing nut has 15/16″ wrench flats. Please let us know if you have any other questions!

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