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

8 Reviews

  • 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

  • 4
    Good Quality

    Published by Albert Ruggles on 8th Oct 2018

  • 5
    Excellent Quality as Usual

    Published by Ryan on 14th Sep 2018

    The 1/2x36 3-lug adapter is machined with excellent quality and finish. It is not just limited to this adapter, I own about 15 various Griffin products and all of them are very high-end. Really pleased time and again. They will be a continued go-to source for many of my needs.

  • 5
    top notch service and products

    Published by harperwc on 18th Aug 2018

    it is oh so nice to come across a company like griffin armament. high quality stuff with folks that really have a great helpful attitude. thank you.

  • 5
    Great option for 3 lug with 300BLK

    Published by Michael McManus on 14th Jan 2016

    I purchased two of these because my favorite mount is the H&K 3 lug system and the thought of not having to change the mount and using it with my cans with 300BLK subs appealed to me. The shipping was very fast and the quality was excellent. I installed them on both of my 300BLK uppers, one 8.5" barrel and one 7.5". The only problem I had was on the 8.5" barreled upper is about 33% to 50% of the time, depending on the ammo (Remington 220 and American Eagle 220) the rounds would go supersonic. They were obviously loaded just subsonic and the higher pressure of the little bit longer barrel in combination with the way the mount makes the blast chamber just a little smaller was enough to push the bullet supersonic. (free bore effect) None of that is a flaw of the adapter nor Griffin's fault. It didn't happen with the direct thread mount or with the 7.5" barrel. I am going to just put a minimalist taper mount on my 8.5" barrel so I can run supers with it too with my 30 cal can.

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