3-Lug 9mm And 45cal Slim Mounts From SilencerCo

As old as the H&K style 3-Lug mounting system is, it still has overwhelming popularity with pistol caliber carbine, sub machine gun and personal defense weapon (PDW) fans who prefer to run suppressed. The simplistic springloaded system is the perfect matchup for compact weapons that break down in to carry bags but may need to be rapidly deployed – silencer and all.

SilencerCo has just released a new version of 3-lug mount compatible with the Omega K, Octane and Hybrid series of suppressors. Yes, SiCo already offers a 3-Lug mount, but the older attachment system is completely external from the silencer tube. The new mount fits almost completely inside the blast chamber saving nearly two inches of added length.

Sure, other manufacturers have made flush tri-lug¬†mounts compatible with SilencerCo silencers for a few years. But it’s nice knowing that factory options are finally available. Details, specifications and pricing are listed below.

New SilencerCo 3-Lug Mount

  • MSRP: $140
  • PART NUMBER: AC2447/AC2448
  • CALIBERS: 9mm/45cal
  • FEATURES: All-new design for a shorter overall length.
  • COMPATIBLE: Octane series, Omega K series, and Hybrid
  • NOTE: The 45ACP 3-lug mount is compatible with the B&T APC 45 3-lug barrel. Our mount will NOT fit on the Griffin Armament 45 caliber 3-lug barrel adapter, due to the smaller size of the adapter.


In comparison to the old SilencerCo design, the new release looks positively svelte.

Previously, the new 3-Lug design was only available as a package deal with the SilencerCo Summit Series B&T APC45 and the Omega 45K. The limited release is only available from Capitol Armory for $3,175.

And.completely unrelated, SilencerCo has started a podcast discussing all types of firearm news. Checkout SiCo Radio when you have a free minute.


LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Twitter: @gunboxready
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  • Henry C

    So will this require a new 3 lug device for the muzzle?

    • Flash Gordon

      No, this just replaces the original 3-lug adapter. They both thread into the suppressor. The new one is recessed internally where as the original adapter was 100% external. This should shorten the overall can length by at least 1.375″.

      The new adapter looks like it may be a tad shorter externally than the GA adapter. The GA adapter does not have holes in it making it not very compatiable with the SiCo cans as it puts the end of the 3-lug adapter at the blast baffle and negates the expansion chamber. The new SiCo adapter does have holes for the expansion chamber. I will order as soon as it becomes available.

  • Flash Gordon

    I sure hope this 3-lug mount has better lockup than their previous offering. I have the original 3-lug mount and there is some wiggle with my Octane and 3-lug adapter.

    • HSR47

      There’s enough wiggle with the SWR/Silencerco 3 lug mount that I’ve seen at least two cases of endcap strikes (My 9mm Octane, and a friend’s 45 Octane with 9mm endcap).

      • Flash Gordon

        After 300 or so rounds I am strike free. I don’t think the new mount can come soon enough.

  • st381183

    The old SiCo tri lug mount has horrible lock up and I refused to shoot my silencer with it. I’ve been using the Griffin Armament tri lug mount on my Octane and it has worked very well with solid lock up. He baffles ar stainless steel and I am not worried about blast chamber erosion at all.

    • Flash Gordon

      This is good to know. Thanks for the feedback on the use of the different mounts.

      The downside to the use of Rugged and GA mounts is that it removes the warranty of the SiCo can if there are any issues. How would they know? They may not, but I would prefer a manufacturer approved part for an NFA item that I have a stamp and months of waiting invested in. I totally agree. The lockup of the original SiCo mount is just horrible. If I have any issues (none yet), I can return the can back to the manufacturer with the mount and expect the issues to be remedied without question.