SiCo Tri Lug Adapter very loose

So I just installed a SiCo tri-lug connector on my Octane 45 for use on some PCC SBRs and the fit from the connector to the tri lug adapter on the barrel is super loose. The can wiggles around enough that I'm afraid to use it with my Scorpion EVO and AR9s. I put my Griffin Armament tri lug connector on my SiCo Octane and the fit is nice and tight with very little wiggle on the can. Has anyone else noticed the loose fit of the SiCo tri lug connector to tri lug adapter? I think I'm going to order another Griffin tri lug connector and sell the SiCo one the wobble is horrendous.

Also I was using a CNCWarrior?? 9mm Bore alignment rod to check for alignment and the wobble was so bad the rod could touch the edge of the 45 end cap. Is this something SiCo would replace or is it normal?

I had the same issues with my SiCo tri lug setup on my mpx. I returned it so SiCo and went with Griffin components.
Lock up has been great and no issues after several thousand rounds.

That's what I am planning on doing.

I would recommend the Rugged Obsidian 3 lug over the Griffin. The same guy designed both the Octane and Obsidian after all. ;)

I have a rugged three lug that I also tried on my octane. Also very wobbly. Might be better on the Obsidian but the Obsidian. Is in jail still

Get one from Griffin. Nice and tight, absolutely no wobble...as I would think it should be.


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I have a Griffin, Rugged, and the SiCo 3-lug mount. Of the three the Griffin works the best and the reason is the beefy spring that applies the pressure to the three lug adapter on the barrel. Of the three mounts, the Griffin has the best lock up and least amount of play in the silencer. I bought the SiCo mount right after I bought the suppressor fearing lack of availability. I am hoping SiCo will refund my money. If not, I may experiment with different lock springs and see if I can't get the SiCo mount to lock up better on the lugs. Or I may just throw it up on GunBroker and sell it to someone who might actually enjoy using it. I actually liked the SiCo mount because it would slip under my super slim rail on my AR9 but the wobble is truly excessive. I probably wouldn't have a baffle or end cap strike but the suppressor rod touches and stays touching on all my platforms.

***EDIT: Oh, and I just purchased a second Griffin 3-lug mount tonight so I can safely run both cans. Better a little more erosion on baffles you can rotate and then replace than potentially having a strike and sending the can off and losing confidence in the entire system.

So Silencerco sent me a new tri lug mount to try out which was pretty nice of them. I tried it out and again the tri lug mount is very loose with a lot of wobble. The common issue that both of the Silencerco tri lug mounts have is not enough spring pressure to really lock up the mount to the barrel adapter. The Griffin tri lug mount is a beast with a strong spring and has become my preferred tri lug mount for my Octane. The Griffin mount is rock solid and shaves over an inch from the overall length of the silencer. If Silencerco would use a stronger spring the looseness of the tri lug mount would be eliminated. I like the narrowness of the Silencerco tri lug mount because it will slip under a super slim hand guard on my AR9 pistol but it is a lot easier to buy a new hand guard than risk a baffle and/or end cap strike. I may be worrying too much about this but there is so much wobble my Octane 45 will easily touch the bore alignment rod when the silencer is mounted with the Silencerco tri lug mount. This probably explains all the end cap strikes on the Octane 45 that used the limited produced 9mm endcap.

I have SilencerCo, Griffin, Rugged, AAC, and Dead Air 3 lugs. They all wobble and rotate to some degree and none have had any problems. True, SilencerCo has the most wobble, the others are all about equal. Still... no problems with the wiggly SilencerCo mount. I wouldn't worry about it.

Has anyone here tried their new tri lug?

I have not used the new SiCo Mount but I’ve used the Griffin tri lug which is comparable. The Griffin works amazingly well and contrary to earlier posts locks up very snuggly on my Octane.

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Originally Posted by st381183

I have not used the new SiCo Mount but I’ve used the Griffin tri lug which is comparable. The Griffin works amazingly well and contrary to earlier posts locks up very snuggly on my Octane.

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Thanks. I have the new SiCo Mount inbound. The savings in length is what interested me. Are you using the Griffin on a SiCo?


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I've read far too many problems with both the long and short versions of the SilencerCo 3-lug, so I've stayed away entirely. I use a Griffin Armament 3-lug and a Rugged 3-lug. I believe the Griffin is the more stable design between the two on paper, but in usage I've found them to be equal. The Griffin mount is about an ounce heavier than the Rugged from what I remember.

https://i.imgur.com/AP62rMP.jpg

New Rugged on the left, heavily used Griffin on the right. See how the Rugged uses an O-ring, and has one point of contact between the inner piston and the outer module? Versus the Griffin, which has two points of contact between the piston and the outer module, and doesn't need an O-ring. I've dedicated my Rugged 3-lug to my SilencerCo Omega 9K, where it lives on my semi-auto MP5K-PDW, and my Griffin 3-lug to my SilencerCo Octane .45, where it will live on my full-auto Sten Mk. II. If you want the absolute lightest mount, I would buy the Rugged. If you want that extra peace of mind, I would buy the Griffin. Both have worked flawlessly for me, and lock up tight.

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Originally Posted by GeneralPurpose

I've read far too many problems with both the long and short versions of the SilencerCo 3-lug, so I've stayed away entirely. I use a Griffin Armament 3-lug and a Rugged 3-lug. I believe the Griffin is the more stable design between the two on paper, but in usage I've found them to be equal. The Griffin mount is about an ounce heavier than the Rugged from what I remember.

https://i.imgur.com/AP62rMP.jpg

New Rugged on the left, heavily used Griffin on the right. See how the Rugged uses an O-ring, and has one point of contact between the inner piston and the outer module? Versus the Griffin, which has two points of contact between the piston and the outer module, and doesn't need an O-ring. I've dedicated my Rugged 3-lug to my SilencerCo Omega 9K, where it lives on my semi-auto MP5K-PDW, and my Griffin 3-lug to my SilencerCo Octane .45, where it will live on my full-auto Sten Mk. II. If you want the absolute lightest mount, I would buy the Rugged. If you want that extra peace of mind, I would buy the Griffin. Both have worked flawlessly for me, and lock up tight.

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Thank you. I was concerned about using another companies mount on the Silencerco can.


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Originally Posted by usmcvet

Thanks. I have the new SiCo Mount inbound. The savings in length is what interested me. Are you musing the Griffin on a SiCo?


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Yes, I exclusively use the Griffin tri lug on my Octane45 HD without any issues. In fact I bought two Griffin tri lugs so I can keep my Griffin Optimus and Octane range ready! The post from GeneralPurpose is dead on. I find my Rugged tri lug just fine for my Obsidian45. The only reason I have a SiCi tri lug at this point is I was buying accessories during my year long wait.

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Originally Posted by st381183

Yes, I exclusively use the Griffin tri lug on my Octane45 HD without any issues. In fact I bought two Griffin tri lugs so I can keep my Griffin Optimus and Octane range ready! The post from GeneralPurpose is dead on. I find my Rugged tri lug just fine for my Obsidian45. The only reason I have a SiCi tri lug at this point is I was buying accessories during my year long wait.

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Mine is the Octane 45 and I have a 9mm Omega in jail. I think if I had a 9mm Octane I’d have had a baffle strike. It really sucks!


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I know this is an old thread but it is one that is very valid.

I had baffle strikes on my Obsidian 9 using a SilencerCo AC2447 (their Alpha 9mm tri-lug). Upon closer examination, it uses only 1 point of contact at the O-ring (imagine the Rugged design shown above but without the second point of contact). It allows the suppressor to laterally wobble enough for the alignment rod to contact the end cap and baffles.

The Rugged version is actually worse for me. I bought a new one because I wanted to find a replacement for the SiCo. The Rugged has 2 points of contact, but the O-Ring contact is sloppy and the second point of contact is super loose in the piston cage of the Obsidian 9. So when I check the lateral play/wobble of the Obsidian 9, its even worse than SiCo.

Here I have the latest Griffin tri-lug. It is super tight and uses 2 points of contact inside its own housing. It is a near interference fit. There is still some lateral play/wobble with the suppressor, but the alignment rod won't contact the end cap or baffle. The Griffin spring is also super heavy and requires a bit of muscle to engage/lock the suppressor in place. I don't feel this is a bad thing.

I contacted Rugged about their tri-lug slop and they claimed that when firing, the suppressor is pressed forward and not to worry about the wobble or lateral play when shooting.

Resilient has a Titanium Tri-Lug for Bravo Threads but they claim its designed for smaller lugged barrel adapters. My Hansohn Brothers uses a 0.29"-0.30" wide lug, and they said it wouldn't fit their tri-lug.

My Hansohn Brothers tri-lug adapter measures 0.590" at the muzzle, while the piston/insert IDs for:

SiCo: 0.5945"

Rugged: 0.593"

Griffin: 0.593"

At this point I would not recommend trying the SiCo or Rugged mounts and to just go with the Griffin.

Rugged, KVP, and SiCo alpha trilug mounts are trash. They wobble enough for baffle strikes because they use an Oring at the piston insert so it allows the can to tilt due to the squish. So much wobble that the alignment rod would smack against the baffles and end cap.

Griffin is the only one that had the least wobble for Alpha threaded adapters. YHM is the same way for Bravo threaded adapters. Both use a piston insert that does not have an Oring. YHM uses an Oring on its tail cap but that is just for support. Doesn't have as much to do with the spring as you'd think.
Resilient has a titanium Bravo trilug but they said it won't work with wider lugs found on hansohn Brothers and other adapters.