M4 Muzzle Thread Adapter

$22.99 - $29.99
(6 reviews)
Current Stock:
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Ideal for attaching our 5/8-24 threaded M11 and M41 Severe-Duty™ Muzzle Brakes to your 1/2-28 or 9/16-24 threaded barrel, as well as mounting suppressors and other alignment critical muzzle devices. Wrench flats on shoulder make installation and removal for use on multiple devices simple and easy. Both Internal and external threads are single point cut in same operation to tight UNEF Class-3 tolerances for perfect concentricity and alignment. Compact design moves muzzle device only .100” forward maintaining full thread joint strength. The M4 muzzle thread adapter is precision CNC machined from pre-hardened HTSR 400-series stainless steel bar for superior heat and corrosion resistance.

Available in an advanced PVD (Physical Vapor Deposition) matte-black finish, offering exceptional durability and corrosion resistance at high temperatures, making it ideal for full auto fire as well as suppressor applications. Also available in matte stainless finish.

1/2-28 Barrel Thread Adapter: Perfect for attaching any 5/8-24 muzzle device to the standard 1/2-28 AR-15/M16 barrel thread.

9/16-24 Barrel Thread Adapter: Ideal for attaching 5/8-24 muzzle device to the 9/16-24 threaded barrel on most 6.5 Grendel's.

NOTE: The shoulder of the M4 Muzzle Thread Adapter will be visible after installation.  If you need an adapter that is completely concealed please see our M4 Shoulderless Thread Adapter.   


External Thread: 5/8x24"
Internal Threads: 1/2x28
Length: 0.625"
OD: 0.825"
Flats: 0.750"
Weight: 0.24 oz
Full Spec Sheet: View PDF


For full specifications, installation manuals, and more - visit our Technical Resources page:


  • 5
    Nice adapter

    Posted by Micah on 13th May 2024

    These adapters are nice and low profile. They do not stick out past the crown on standard length threads.

  • 5

    Posted by LANE LLC on 25th Mar 2024

    I have purchased a lot of these adapters and they just plain work.

  • 5
    Great Product

    Posted by Jim Engel on 25th Mar 2024

    We have used dozens of these 1/2 to 5/8 adapters and have never had a problem with these. If you need an adapter, this is it. They are precision made.

  • 5
    Muzzle thread adapter

    Posted by Tipton Burns on 27th Nov 2023

    I use these all the time and have never had any problems or issues with them. Consistently on the money.

  • 5

    Posted by Average Joe on 3rd Nov 2023

    The picture on the website doesn't do it justice. The quality and finish is top-notch!!!

  • 5
    Excellent product

    Posted by Greg Compton on 25th Feb 2023

    First time customer of Precision Armament. I bought a 5/8x24 to 1/2x28 to run my 30 caliber suppressor on my AR15. Shipping was very quick. Fit and finish of the product is excellent. I would definitely recommend this product to anyone wanting to run a 30 cal can on your MSR.