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Gas Blocks - Clamp it or Drill it? Tell me Why or Why Not... Adjustable Type

Discussion in 'Rifle Discussion' started by John Gault, Mar 18, 2016.

  1. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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    Putting together parts for my first build. Going to be 300BO SBR (8.5") Suppressed.

    Looking at types and brands of Adjustable Gas blocks to use. Didn't see any recent discussion here about clamp vs drilled install. Why one and not the other? Anyone know of a clamp on adjustable that fits under a rail?
     
  2. slimer13

    slimer13 Deer Park Well-Known Member

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  3. 2A2Dend

    2A2Dend .. Well-Known Member

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    Using micro gas blocks, I dimple the barrel by using longer screws that are ground to a point. Be sure to use the appropriate "offset" washer for alignment of the gas port if necessary. Assemble the barrel and gas block in it's final mounted form, and mount to the upper. My method is with charging handle and bolt carrier group in place. Once happy with alignment, turn screws into barrel to "mark" drill points. I then use a piece of brass tubing around a 1/16" drill bit (with a stop collar) to drill the dimple to a depth of 1/8". Then I remove the gas block, and drill the dimple to one size down from the hex screw diameter.
     
  4. ZigZagZeke

    ZigZagZeke Eugene Silver Supporter Silver Supporter 2015 Volunteer

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  5. mjbskwim

    mjbskwim Salmon,Idaho Well-Known Member

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    I think that's the one I used on most of my builds. Then the options for rails and such expand
    The only type I know that are drilled are the pinned ones.Then the barrel needs to have the bottom relieved for the pins.
    Otherwise I can't see any reason to drill anything
    Easiest way to see if it's aligned correctly is just spray some cleaner,thru the little red tube,into the gas tube. If the cleaner comes out of the port in the barrel you have the block set correctly
     
  6. Iceman04503

    Iceman04503 Portland, or Active Member

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    I have the syrac adjustable gas block clamp on and it fits really nicely under my seekins noxs handguard just fine.
     
    John Gault likes this.
  7. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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    I'm looking hard at Seekins for the Rail/Guard
     
  8. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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  9. Iceman04503

    Iceman04503 Portland, or Active Member

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    You know what rail/guard and length?
     
  10. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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    Not that far yet.. I'm thinking 8" barrel with a Silencer Co break on the end. Want the can to go behind/inside the rail a couple inches but this is all theoretical at this point...
     
  11. Cameron72

    Cameron72 Harrington, WA Bronze Supporter Bronze Supporter

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    Syrac adjustable with set screw or clamp on have yet to let me down. A dimple opposite the gas port greatly aids in getting the gas block aligned with that port. A misaligned gas block can act like several other gremlins that will have you tearing your hair out, making you hate your new AR build.
     
  12. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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  13. John Gault

    John Gault clackamas county Bronze Supporter Bronze Supporter

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    I see myself having to watch some vids on this process. Likely that parts will come from Curt's so hopefully they will offer assistance when the time comes....
     
  14. ZigZagZeke

    ZigZagZeke Eugene Silver Supporter Silver Supporter 2015 Volunteer

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    The round, hollow hand guard on the 24" Varminter barrel fits over this gas block, and the block can be adjusted from the front without removing the hand guard.