Oversize gas port on 16" barrel?

[prepare]

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.

[opngrnd]

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.

[prepare]

Who makes that pin gage set? I concur about Sionics.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[MikhailBarracuda91]

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

[opngrnd]

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?

[MikhailBarracuda91]

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

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[AndyLate]

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.

[prepare]

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.

[AndyLate]

Thank you.

Andy

[everready73]

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