Page 3 of 3 FirstFirst 123
Results 21 to 30 of 30

Thread: Oversize gas port on 16" barrel?

  1. #21
    Join Date
    Dec 2015
    Location
    The New World
    Posts
    767
    Feedback Score
    0
    A quality builder will have pin gages and measure and record the Gas Port size for every build.
    I source known quality barrels and measure every gas port.
    Daniel Defense has reduced their gas ports over the last couple years. Sionics has perfect sized gas ports as do SOLGW, Centurion, and Rosco. I won't go so far as to say BCM's are too big but of the barrels mentioned BCM's are a shade bigger in all barrel length's in both carbine and mid.
    Attached Images Attached Images
    Last edited by prepare; 01-05-20 at 10:52.
    Big brother is watching...and listening.

  2. #22
    Join Date
    Mar 2011
    Location
    Mid-West, USA
    Posts
    1,875
    Feedback Score
    37 (100%)
    Quote Originally Posted by prepare View Post
    A quality builder will have pin gages and measure and record the Gas Port size for every build.
    I source known quality barrels and measure every gas port.
    Daniel Defense has reduced their gas ports over the last couple years. Sionics has perfect sized gas ports as do SOLGW, Centurion, and Rosco. I won't go so far as to say BCM's are too big but of the barrels mentioned BCM's are a shade bigger in all barrel length's in both carbine and mid.
    Who makes that pin gage set? I concur about Sionics.

  3. #23
    Join Date
    Dec 2015
    Location
    The New World
    Posts
    767
    Feedback Score
    0
    Quote Originally Posted by taekwondopreacher View Post
    Who makes that pin gage set? I concur about Sionics.
    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
    Big brother is watching...and listening.

  4. #24
    Join Date
    May 2019
    Posts
    4
    Feedback Score
    0
    The only proper way to measure the inside diameter of a hole is with pin gauges. For quality control purposes you have to produce exact and repeatable results with any measurement. It's not as simple as drop the pin in the hole.

    Sent from my SM-G970U using Tapatalk

  5. #25
    Join Date
    Mar 2011
    Location
    Mid-West, USA
    Posts
    1,875
    Feedback Score
    37 (100%)
    Quote Originally Posted by MikhailBarracuda91 View Post
    The only proper way to measure the inside diameter of a hole is with pin gauges. For quality control purposes you have to produce exact and repeatable results with any measurement. It's not as simple as drop the pin in the hole.

    Sent from my SM-G970U using Tapatalk
    How do you go about doing it?

  6. #26
    Join Date
    May 2019
    Posts
    4
    Feedback Score
    0
    Obviously if the pin slips right in with no resistance at all then it's to small, you have to find the gauge that just kisses the surface. Be careful not to push an oversized pin in. A quality pin gauge will be tool steel, and that's hard enough to permanently damage a gas port even if it's only .002 oversized.

    Be patient, my quality guy used to scream at me over this lol so I learned with caution

    Sent from my SM-G970U using Tapatalk

  7. #27
    Join Date
    Feb 2016
    Location
    Mars
    Posts
    1,317
    Feedback Score
    14 (100%)
    Quote Originally Posted by prepare View Post
    A quality builder will have pin gages and measure and record the Gas Port size for every build.
    I source known quality barrels and measure every gas port.
    Daniel Defense has reduced their gas ports over the last couple years. Sionics has perfect sized gas ports as do SOLGW, Centurion, and Rosco. I won't go so far as to say BCM's are too big but of the barrels mentioned BCM's are a shade bigger in all barrel length's in both carbine and mid.
    What is the purpose of measuring and recording the gas port for every build? Do you return barrels with a larger or smaller than expected port? I appreciate the effort and information, don't get me wrong.

    In a perfect world, the barrel makers would supply the information accurately and freely.

    It's interesting to me that Roscoe ports are spot on, given they are on the budget end of the spectrum.

  8. #28
    Join Date
    Dec 2015
    Location
    The New World
    Posts
    767
    Feedback Score
    0
    Quote Originally Posted by AndyLate View Post
    What is the purpose of measuring and recording the gas port for every build? Do you return barrels with a larger or smaller than expected port? I appreciate the effort and information, don't get me wrong.

    In a perfect world, the barrel makers would supply the information accurately and freely.

    It's interesting to me that Roscoe ports are spot on, given they are on the budget end of the spectrum.
    I keep a data book on my rifles that includes the build information (parts, springs, BCG, etc, where they were purchased) , prices, firing schedules, ejection pattern, zero and ammo type, if any malfunctions occur (so far none). This way I have my own reference and can compare differences. My sample of 2 Rosco barrels have correct gas ports. I bought them mostly for testing, evaluation, and comparison.

    Out of the many barrels I have, only 3 were over gassed. I used BRT custom tuned gas ports to fix that issue. But I use that information to know who to source from and who not to and what I'm getting.
    Last edited by prepare; 01-06-20 at 05:37.
    Big brother is watching...and listening.

  9. #29
    Join Date
    Feb 2016
    Location
    Mars
    Posts
    1,317
    Feedback Score
    14 (100%)
    Thank you.

    Andy

  10. #30
    Join Date
    Apr 2017
    Posts
    774
    Feedback Score
    0
    Quote Originally Posted by AndyLate View Post
    What is the purpose of measuring and recording the gas port for every build? Do you return barrels with a larger or smaller than expected port? I appreciate the effort and information, don't get me wrong.

    In a perfect world, the barrel makers would supply the information accurately and freely.

    It's interesting to me that Roscoe ports are spot on, given they are on the budget end of the spectrum.
    I am actually thinking about giving a Roscoe barrel a try on a build I am going for my uncle.

    Both garandthumb and sage Dynamics have posted positive YouTube reviews on them. I take reviews with a grain of salt but those 2 are generally pretty honest imo.

    Sage posted a recent vid that showed impressive accuracy with an sbr and longer stainless barrel

Page 3 of 3 FirstFirst 123

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •