Roll Pins

Discussion in 'Gunsmithing - Assembly - Finishing' started by KnotRight, Jun 19, 2019.

  1. KnotRight

    KnotRight Well-Known Member Charter Member Benefactor Life Member

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    I know this is an open end questions but:

    Does anybody know what size roll pins "MOST" milspec ARs take in the gas block and trigger guard?

    I bent one the other day and would like to have a couple extra on hand. I have a set of 4 roll pin starter punches and there was not one the right size. Just order a set of 8 roll pin starter punches.
     
  2. Combat Diver

    Combat Diver Well-Known Member

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    Most low profile gas block use set screws to hold in. The Front Sight Base/A frame uses taper pins measuring from .115 on the small end ie. Brownells No.4 roll pin holder (1/8" 3.2mm) to .13 large end fitting Brownells No.5 roll pin holder (3.5mm) I never use a roll pin starter for taper pins. Use the largest punch I have and either a 3 or 5 lb hammer.

    IMG_6575.jpg

    The trigger guard pin is .115-.12" dia and again fits in a Brownells No.4 roll pin holder (1/8" 3.2mm)


    CD
     
    Last edited: Jun 19, 2019
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  3. KnotRight

    KnotRight Well-Known Member Charter Member Benefactor Life Member

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    CD, thanks. The gas block uses a pin to hold the tube in the block.
    Also, the forward asst has a pin. That is the one I bent.
    That block in your picture, how does it work with the slant of the gas block getting level? Hope you understand that question.
     
  4. Combat Diver

    Combat Diver Well-Known Member

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    Ok, so you're referencing the gas tube roll pin on the gas block. My mistake. Diameter roughly .08", 5/64" or 2 mm. Brownells No.2 Roll Pin Holder
    The Forward Assist Pin is a diameter of .1", 3/32" or 2.4mm. Brownells No.3 Roll Pin Holder

    On the Brownells FSB block remember the barrel is inserted also. For a low profile gas block, I open the jaws of my vise a bit, lay a towel down over and set the gas block in the gap. Use the roll pin holder to tap the roll pin into the gas block/gas tube.

    https://www.brownells.com/gunsmith-...-set-sku080685000-781-3016.aspx?sku=080685000
    https://www.brownells.com/gunsmith-.../ar-15-front-sight-bench-block-prod20727.aspx

    CD
     
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  5. KnotRight

    KnotRight Well-Known Member Charter Member Benefactor Life Member

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    Thanks,

    Ricky
     
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  6. beamernc

    beamernc LTC - Liberal Tear Collector Charter Member Supporting Member

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    I found this several years ago and saved it.

    www.mscdirect.com MSC has machine tools, hardware, etc

    Item # 67501122
    Desc 1/16X7/16 Coiled Spring Pins-EJECTOR

    Item # 67501445
    Desc 3/32X7/16 Coiled Spring Pins-BOLT CATCH

    Item # 67501569
    Desc 3/32X5/8 Coiled Spring Pins-TRIGGER GUARD, REAR SIGHT, FORWARD ASSIST

    Item # 67594085
    Desc 1/16"" x 1/4"" SPRING DOWEL PIN 420 SS-FORWARD ASSIST PAWL

    Item # 67501163
    Desc 1/16X1/2 Coiled Spring Pins-WINDAGE KNOB

    Item # 09265067
    Desc -006 VITON PAK OF 100 VITON O-RINGS -EXTRACTOR O-RING

    Item # 67594481
    Desc 5/64"" x 3/8"" SPRING DOWEL PIN 420 SS - GAS TUBE........1/16" TOO LONG, TRIM

    Item # 00073379
    Desc 1/8 SS440 GRADE 100 440-C STAINLESS BALL100PK - REAR SIGHT BALLS


    Item # 09578113
    Desc 5/64" x 5/16" Spring Dowel Pin SS - Gas tube, gas block $3.19/100


     
    Last edited: Jun 19, 2019
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  7. NKD

    NKD Senior Member Benefactor Kimberless Supporting Member

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    376412171_Rollpinsizes.thumb.png.e057dd590fbad94031aa571f4ee2a7be.png
     
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  8. Ronsc

    Ronsc LIberalism is a disease..

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    Now this is great info guys...Thanks to all for sharing!!!
     
  9. georgel

    georgel Behind Every Blade of Grass

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    Wait, should this thread be pinned? :D
     
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