Silencer adapter for 9mm AR – 1/2×36 TPI to thread of your choice


To convert the thread of your 9×19 AR15 rifle or pistol, we offer this silencer adapter for 9mm AR. It will transform the 1/2×36 TPI thread to another standard. A custom CNC part for your Colt AR-15 9 mm, Angstadt Arms, or Ballistic Advantage barrel.

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Why do 9mm AR rifles often have a 1/2×36 TPI thread?

The silencer adapter for 9mm AR that we offer here has a simple mission. Convert the 1/2×36 TPI thread found on most AR-15 pistols and carbines in 9×19. But why do 9mm AR type rifles often have a thread in 1/2×36 TPI and not in 1/2×28 TPI as you would expect?

This is simply because the 1/2×28 TPI thread is the default thread of AR-15 in .223 Remington or 5.56 NATO. It is therefore important to prevent a 9×19 AR owner from screwing a .223 caliber suppressor or flash hider at the end of his weapon. This avoids the stupid accident. This is why when an AR barrel is in 9 mm caliber, even if its external diameter would have allowed a 1/2×28 TPI, it is better threaded in 1/2×36 TPI. This exotic thread acts like a foolproof device, to avoid confusion between muzzle devices for AR-15.

More alternatives with our silencer adapter for 9mm AR

Of course today, this wise safety measure is sometimes set aside by manufacturers who prefer to open maximum compatibility. But serious houses like Colt, Angstadt Arms or Ballistic Advantage continue to produce 9×19 barrels for AR-15 with 1/2×36 TPI thread. It will then be up to our silencer adapter for 9mm AR to open the spectrum of compatible accessories to you.

This thread converter transforms 1/2×36 TPI into the thread of your choice. Just use our drop-down menu to find out what combinations are available. Of course, if you can’t find the desired output thread, contact us,we can also make single parts. Going from 1/2×36 TPI to 1/2×28 TPI for example then becomes a breeze.

A high-quality custom piece for your AR-15 in 9×19

Every silencer adapter for 9mm AR that we machine is subject to very strict quality controls. We are thus able to guarantee a perfect concentricity between your barrel, and your suppressor or your flash hider.

We use an XC38 steel also called C35. Each adapter benefits from a hot bluing, performed by a professional of surface treatment in the rules of the art. A 100% made in France part, that we are proud to ship worldwide.

Additional information

Weight 60 g
Dimensions 35 × 22 mm


Maximum bullet diameter

.354 in (9 mm)

Barrel thread

1/2×36 TPI


Blued steel


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