9mm 3 Lug Barrel Adapters

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These 3 Lug adapters are HK pattern and will work with any 3 lug silencer on the market made to this standard. They will also work with Griffin 3 lug interface assemblies

The 5/8x24 and 13.5x1mm LH versions have a cylindrical machined extension added to the mount. The 13.5mm version has flats for a wrench on that cylinder extension and has the O-ring interface typical of 13.5x1 LH mounts. The other 3 Lugs are the smaller version pictured.
The 5/8x24 is meant to provide a 3 Lug mount to 30 caliber barrels but is also compatible to 9mm barrels where that thread is uncommonly used. Most 30 caliber barrels are threaded 5/8x24 thread pitch.

1/2x28 Thread Total Length: 1.4375". Based off of industry standard .625" barrel threads, added length should be ~.8125".
5/8x24 Thread Total Length: 2.125". Based off of industry standard .625" barrel threads, added length should be ~1.5".

Made from 17-4ph stainless and Melonite QPQ treated.

  • 17-4 construction

Additional Details

Thread Pitch:
Thread Pitch:
Thread Pitch:
Thread Pitch:
13.5x1mm LH
Attachment System:
3 Lug
Type Of Part:
3 Lug

14 Reviews

  • 4

    Published by Rodney on 12th Aug 2020

    A good fit, patiently waiting for 1/2-28

  • 5

    Published by CT Anderson on 6th Aug 2020

    Fits on my 9MM AR perfectly. Mates up to my Optimus 9 and makes for quick and easy installation and removal. This and the 3 Lug Interface for a suppressor are a necessity.

  • 4
    3 Lug Barrel Adapter on MPXK

    Published by Z. White on 3rd Jul 2020

    Fitment on my MPXK was great! My Rugged Obsidian suppressor with 3 lug adapter goes on and off with ease. Wish they would put some kind of channels In the adapter to resemble the original bird cage.

  • 4
    They work as advertised.

    Published by Art on 16th May 2020

    It works as advertised. Machining and finish are very nice. The price is seriously inflated and Griffin knows that. It's too bad with the money you spend on this stuff they can't make all the extras a little more reasonable

  • 5
    Quality Piece

    Published by Ted on 18th Mar 2020

    Everything GA makes is quality. I used one of these to convert a direct thread setup to 3 lug and I wish I had done it sooner. Highly recommended!

  • 5
    9mm 3 Lug Adapter

    Published by Eric H on 18th Jan 2020

    Awesome product! Great quality workmanship and I would recommend this 3 Lug Adapter if you have a Sig MPX.

  • 5
    3 lug adapter

    Published by Cody White on 18th Jun 2019

    Solid fit, and easy to install. Makes switching from firearm to firearm quick and easy.

  • 5
    3 lug adapter

    Published by Mike cerino on 9th Jun 2019

    Simple and solid attachment. Fits snug with three lug interface. Very easy connect/disconnect

  • 5
    3-lug adapter

    Published by Kyle on 1st Apr 2019

    Griffin has done it again. They take amazing products and make them better. The fit and finish is top notch. This makes switching cans from pcc's to fixed barrel pistols effortless. I can switch from my 9mm AR, to Ruger pcc, to 15-22, to a 22 pistol in no time. More time shooting and less time fooling with cans. Buy one for each host you wont regret it.

  • 5

    Published by Derek on 6th Dec 2018

    Use these tri lugs on all my pistol carbines

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