M4 Muzzle thread adapter

M4 Muzzle Thread Adapter

SKU:
A02000
$22.99 - $29.99
(18 reviews)
Current Stock:
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DESCRIPTION

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.   

SPECS
External Thread: 5/8x24"
Internal Threads: 1/2x28
9/16x24
Length: 0.625"
OD: 0.825"
Flats: 0.750"
Weight: 0.24 oz
Full Spec Sheet: View PDF

RESOURCES

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

Reviews

  • 5
    The only adapters we use.

    Posted by JF on 29th Sep 2025

    We've seen plenty of different adapters come through the shop but Precision Armament are the only ones we use. Sufficient shoulder for suppressor use while still being compact and light weight. The wrench flats are an ideal thickness and not obnoxious like some cheaper ones.

  • 5
    Great fit and function

    Posted by Chad Baldwin on 24th Aug 2025

    Awesome product. Used the 9/16-24 to 5/8-24 adapter on an old Browning BAR that had a BOSS muzzle device to use my suppressor on it. Now my super loud .270 win is super quiet and pleasant to hunt with.

  • 5
    Great

    Posted by RH on 7th Apr 2025

    Works great I have two so far will likely get more.

  • 5
    m4 muzzle thread adapter

    Posted by andrew j. boyak, andys long distance shooters on 4th Mar 2025

    been using these alot. clean, precise

  • 5
    PERFECT FIT

    Posted by Brett Faubion on 11th Feb 2025

    Part came in and fit perfect and looks clean!

  • 5
    Thread adapter

    Posted by Dale Leiztritz on 5th Feb 2025

    Excellent fit and finish just right for inconspicuous installations.

  • 5
    M4 Muzzle Thread Adapter

    Posted by Chase Newton on 14th Oct 2024

    I believe this is the 10th one of these I have used so I can run my Suppressors on thin rifle barrels. All have been perfectly machined. I just permanently attach them to my barrels using Loctite 620 and have never had an issue. Thanks for such a great product!

  • 5
    Threaded Adapter

    Posted by Marty G on 25th Sep 2024

    Exactly what i was looking for, gives me some flexibility on moving cans.

  • 5
    1/2 to 5/8

    Posted by Charles on 12th Sep 2024

    I bought these so I could adapt 3 ARs to mount suppressor that used a attachment that is 5/8 thread. I also bought the shim pack to assure correct alignment. I had all three done in a hour. Thanks guys