Thread Adapter - 13.5x1LH to 5/8x24

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Breek Arms offers a low cost option for thread adapters, which allow you to convert your uncommon barrel thread pattern to something more available on the market such as the Sig MPX. Our M13.5x1LH thread turns your barrel into a very common 5/8x24 thread that is available at most shops. This works great for opening up your options for any M13.5x1LH barrels. We offer multiple styles of muzzle devices in the common 5/8x24 thread but only a couple have exit holes that will allow for a 9mm or 45 cal round to exit properly. See these two listings below.

Both the flash hider and muzzle brake have outside threads which allows you to quickly detach your own Breek Arms Blast Shield or suppressor.

  • Design: Thread adapter 9mm or 45 Cal Conversion
  • Female Thread: M13.5 x 1 LH
  • Outside Thread: 5/8 x 24 TPI
  • Material: Pre Hardened Steel
  • Overall length: 0.95"
  • Weight: 0.7 oz
  • Adds approximately 0.325" inches to the overall length of your barrel

WARNING: Most 5/8x24 threads are for made for 30 calibers. Please make sure to double check you are using at least a 9mm exit hole when installing this adapter.

3 Reviews Hide Reviews Show Reviews

  • 1
    Parts not compatible and customer service ghosted me

    Posted by J on Mar 9th 2023

    I purchased this, a muzzle and a blast shield but would not thread together. Then I Inquired about it to customer service and after a couple of replies I never heard back from them.

  • 5
    Thread Adapter

    Posted by Bruno on Mar 1st 2023

    Fix every well on my sig mpx barrel

  • 5
    MPX Adapter

    Posted by Dave on Oct 11th 2022

    Glad I found this adapter it's been a great help on my Sig MPX!