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Thread: Barrel detent for gas block set screw necessary?

  1. #21
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    Quote Originally Posted by aleaddict View Post
    While doing a search for "pinned low profile gas block" I ran across this image:



    Has anyone else tried this? It seems to me that two set screws (with dimples) on the bottom plus a horizontal cross pin along the top would make for a bullet-proof setup, but what do I know. lol

    -- ale
    This is a Daniel Defense gas block, and it is intentionally designed to be pinned at the top. It works great.

    EDIT: That being said, I think they discontinued this method of pinning and now pin at the bottom. But they did pin from the top for about 2 yrs.
    Last edited by justin_247; 01-14-13 at 11:43.

  2. #22
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    That's flat out scary... It looks like the pin is taper too.. might just be the picture... A taper pin will really pull on the block.
    "You people have too much time on your hands." - scottryan

  3. #23
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    Quote Originally Posted by Col_Crocs View Post
    ETA: Ale, I wouldn't use a roll pin. You need either a straight pin (not sure what spec), or a 2/0 taper pin, for which you need a #31 bit and a 2/0 reamer.
    HK uses a roll pin and that is on a piston gun where the gas block is actually hit by the piston/op-rod on return. On DI you really just need something that won't come loose from the vibration and heat cycling, I'd be fine with a roll pin.

  4. #24
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    Quote Originally Posted by Todd.K View Post
    HK uses a roll pin and that is on a piston gun where the gas block is actually hit by the piston/op-rod on return. On DI you really just need something that won't come loose from the vibration and heat cycling, I'd be fine with a roll pin.
    Yep... I have an Adco that's got a roll pin for the gas block. Looks like some clown did the job in his garage, but it's under the handguard and works fine.
    "You people have too much time on your hands." - scottryan

  5. #25
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    Our gas block is supplied with a coil pin,
    which is more heavy duty than a standard split roll pin,
    but just as easy to install.
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
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  6. #26
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    Quote Originally Posted by Todd.K View Post
    HK uses a roll pin and that is on a piston gun where the gas block is actually hit by the piston/op-rod on return. On DI you really just need something that won't come loose from the vibration and heat cycling, I'd be fine with a roll pin.
    I read about this a while back but IIRC, there wasn't too much further discussion on it that provided more info. Makes sense, especially on a low-pro under a rail. It would be a much easier job as well.

  7. #27
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    Personally, I would never use set screws to attach a gas block to a barrel.
    Acta Non Verba

  8. #28
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    Thanks for all the feedback. Tonight I used a transfer punch to mark the center of the set screw holes. I'll dimple the barrel and add a cross pin once everything is secured with the screws. I think the roll pin (take-off from the trigger guard), combined with the set screws will provide adequate support under the GB. I'll post pics when I get rolling on this project.

    -- ale

  9. #29
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    Yes, please do. I'm interested to see how it turns out, especially with the roll pin.

  10. #30
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    If you are going to depart from the proven taper pin you might want to consider a grooved pin. I think a trigger guard roll pin is a bit light for this application. I understand why you would want to depart from the taper pin if you did not have the correct reamer.

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