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Thread: how to see what size gas block

  1. #1
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    how to see what size gas block

    I need to get an adjustable gas block for my suppressed sbr. I am literally sitting round from 12:15 to about 1:30 on the clock. I'm also getting some jams. it's a 10.5 faxon barrel with a suppressor. the only markings I can find on the barrel are 5.56 NATO 1-8T 416R.

    Do yall think it would have what barrel profile or gas block size stamped somewhere else away from these marking? I don't want to have to remove my rail but as it's perfect on there. there's either .625 or .750 by this manufacturer

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  2. #2
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    Read wrong
    Last edited by everready73; 08-06-18 at 20:00.

  3. #3
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    Check out black River tactical gas block inserts to cut back the port size. It's cheaper and don't have to replace gas block. They also have gas tubes that reduce gas flow
    Last edited by everready73; 08-06-18 at 20:01.

  4. #4
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    Right way: buy calipers
    Other way: wrap string around journal, mark intersects, measure and calculate circumference.

  5. #5
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    Call me crazy, but I can't figure out what the heck you are asking. Do you want to know what gas block size do you need? Or are you asking how to fix the malfunction issue?



    Owner/Instructor at Semper Paratus Arms

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  6. #6
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    Quote Originally Posted by Iraqgunz View Post
    Call me crazy, but I can't figure out what the heck you are asking. Do you want to know what gas block size do you need? Or are you asking how to fix the malfunction issue?
    gas block size I need. hopefully the adjustable gas block will fix the issue. I might just order both sizes and return the one that doesn't fit! what's the go to adjustable gas block? I was thinking the seekins

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  7. #7
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    Your barrel is either a .625 or a .750. The Faxon website should have it listed and it should say which size.

    Quote Originally Posted by stx.dead.I View Post
    gas block size I need. hopefully the adjustable gas block will fix the issue. I might just order both sizes and return the one that doesn't fit! what's the go to adjustable gas block? I was thinking the seekins

    Sent from my SM-G955U using Tapatalk



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  8. #8
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    SLR or superlative arms are two of the better ones

    If it is going to stay suppressed a gas block insert from BRT is cheaper and less moving parts

  9. #9
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    Quote Originally Posted by Iraqgunz View Post
    Your barrel is either a .625 or a .750. The Faxon website should have it listed and it should say which size.
    the website does have it listed on their models and the 10.5 model barrels are either .625 or .750. I looked over the whole barrel and couldn't find any other markings

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  10. #10
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    Quote Originally Posted by everready73 View Post
    SLR or superlative arms are two of the better ones

    If it is going to stay suppressed a gas block insert from BRT is cheaper and less moving parts
    it may not stay suppressed though

    Sent from my SM-G955U using Tapatalk

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