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Thread: 3-Lug Help needed (Rugged Obsidian)

  1. #1
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    3-Lug Help needed (Rugged Obsidian)

    Hi guys,

    I don't have any experience with 3-Lug but was looking for a quick attachment method for running my Obsidian 45 on a CZ Evo Scorpion and 3 Lug seemed to fit the bill.

    I bought the Obsidian 3-lug adapter for my suppressor and bought a Griffin 3-Lug adapter.

    Unfortunately, when I try to mount the suppressor onto the 3-lug there isn't enough clearance to get it to engage to the point that I can rotate it and get it to lock up when I push it down onto the 3-lug muzzle device. I push it down as hard as is possible, it gets to a hard stop with the spring compression and I am unable to rotate it at all, so I know that the lip of the suppressor mount is not clearing past the lips on the 3-lug points.

    If I remove the spring from the 3-lug adapter on the Obsidian there is ample clearance for engagement.

    Is there anything I can with this before I contact Obsidian? I could file or cut the spring to shorten it but that seems like a poor idea since I just got it. Another thing I thought of is to run a gasket on the Obsidian adapter where it mates with the body of the suppressor in order to increase the clearance since then it should work.

    The only other thing I can think of is that the Griffin 3-lug mount is out of spec. Seems unlikely but I guess it's possible.
    Last edited by gunf1ghter; 10-11-17 at 20:39.

  2. #2
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    You mean you are using a Griffin mount to attach a Rugged silencer?
    Does Rugged make a 3lug mount for their cans?

    Sent from my SAMSUNG-SM-T377A using Tapatalk
    Last edited by MontePR; 10-11-17 at 21:03.

  3. #3
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    Quote Originally Posted by MontePR View Post
    You mean you are using a Griffin mount to attach a Rugged silencer?
    Does Rugged make a 3lug mount for their cans?

    Sent from my SAMSUNG-SM-T377A using Tapatalk
    No, I have a Rugged Obsidian with the Rugged 3 lug integrated host mount that you screw onto the suppressor in place of a piston, fixed spacer or fixed threaded adapter.

    On the rifle barrel I have a Griffin 3-lug muzzle device.

  4. #4
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    Griffin Armement 3 lug barrel mounts are known to be oversized. I use Troy USA 3 lug barrel devices and my Obsidian Tri lug mount and griffin mounts work fine. I don’t know why there is a problem with the Griffin adapters but SilecerCo flatly says that they will not fit a SiCo tri lug mount.

    Edit** The 3-lug barrel adapter is by TROSUSA not Troy USA. Sorry bout that. Here’s a link:

    https://www.brownells.com/rifle-part...prod45432.aspx

    They are offered for sale all over the inter webs.
    Last edited by st381183; 10-13-17 at 12:32.

  5. #5
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    I called HK parts and they say that their 3 lug mounts are not made by griffin.

    However, they acknowledged that they have had users have these issues who own the Rugged Obsidian this year and said there could be enough variation in the 3-lug adapter length to cause the issue.

    They have offered to send another unit to me after I send mine back to test out and see if I have more success with it.

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