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Thread: Using a trigger guard pin to pin a lo-pro gas block

  1. #1
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    Using a trigger guard pin to pin a lo-pro gas block

    Got a used BA barrel and BA lo-pro gas block and need to get a pin, to pin it to the barrel.

    Read that the BA gb uses a 1/8Ē roll pin that is the same size as the trigger guard roll pin.

    Before I try to find my spare trigger guard pin to check if it will fit, I tried to google if anyone used a trigger guard pin for their gb. My Google Fu came up with nothing.

    Is a roll pin for the trigger guard okay for use with a gb? Or is a gb pin different to better handle the heat/temp?

    If different, Iíll order a pin from BA.

    (I could call BA but based on one personís experience with BA, Ill get the correct answer here)

    Tnx in advance!

  2. #2
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    As long as you ream the hole to wear the pin stays, It'll be fine. I have some Adco abomination that has a role pin holding the block, and It's been fine.
    "You people have too much time on your hands." - scottryan

  3. #3
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    probably will not work. There are two types of pins often called roll pins - one is a c-spring pin like on the trigger guard, the other type is a coil spring (similar to a Geissele Super Gas block).
    Gas blocks from what I've seen are held in place by a coil spring. Size-wise it might work. It might even hold for a long time. But I don't think that would be 100% reliable for this purpose.

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    I think you're right. I've seen the Geissele coil spring. I think my Adco just has a plain roll pin.
    "You people have too much time on your hands." - scottryan

  5. #5
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    I read about coil pins and taper pins....was wondering about that. The guy that mentioned a roll pin might have been using a coil pin but used the wrong terminology.

    I’ll try to see if the tg pin fits out of curiosity and double check with BA

    The barrel is for a range toy - not home use - so it doesn’t have to be 100% but it would really suck if my toy went down at the range. I’m neutered and only get 1 pass each month

    Tnx!

  6. #6
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    You could always just do it right and pick up a BRT Gas Block Pin Kit - Coil Pin

    Black River Tactical
    BRT OPTIMUM Barrels - 16" EXT, 11.5" CAR, 9" PDW
    BRT Covert Comps 7.62 + 5.56 + 9mm
    BRT MarkBlue Gas Tubes - BRT EXT and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  7. #7
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    Taper pins are solid pins used for FSB installation:
    Use this: https://www.bravocompanyusa.com/BCM-...%20fsb%202.htm
    To install this: https://www.bravocompanyusa.com/AR15...base-f-750.htm
    (need a reamer as well to install taper pins)

    I can't recall where or what manufacturer, but I have seen a picture online of a solid pin (one, not two) being used for a low profile gas block as well.

  8. #8
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    Quote Originally Posted by tim808 View Post
    Got a used BA barrel and BA lo-pro gas block and need to get a pin, to pin it to the barrel.

    Read that the BA gb uses a 1/8Ē roll pin that is the same size as the trigger guard roll pin.

    Before I try to find my spare trigger guard pin to check if it will fit, I tried to google if anyone used a trigger guard pin for their gb. My Google Fu came up with nothing.

    Is a roll pin for the trigger guard okay for use with a gb? Or is a gb pin different to better handle the heat/temp?

    If different, Iíll order a pin from BA.

    (I could call BA but based on one personís experience with BA, Ill get the correct answer here)

    Tnx in advance!
    I think either would work. A slotted roll pin is not the wrong pin for the application, though.

    The slotted spring/roll pin is best for situations with a static load, the coiled spring/roll pin is best for situations with a dynamic load. https://www.spirol.com/library/white...embly_Life.pdf

    The gas block application would be more of a static load.
    Last edited by 26 Inf; 07-25-18 at 16:57.
    "If I had asked people what they wanted, they would have said a faster horse." - Henry Ford

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  9. #9
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    26 inf - Tnx for the info the different types of pins!

    I agree the roll pin will work but I noticed that the gas block makers include a coil pin...so I’ll go with a coil for peace of mind....and to support BRT :-)

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