Sionics 11.5 barrel w/ reduced gas port function report.

[markm]

Maybe we can get an M4C batch run. 75% off!!!

[jpmuscle]

Maybe we can get an M4C batch run. 75% off!!!

I'd buy one.

I'd really like a lightweight version too.

My 11.5 bcm elw is going to spoil me.

[jerrysimons]

I was actually surprised on the reasonable port size of the 12.5 N4. These days, it seems like a lot of people feel like the Noveske barrels are a tad overgassed for extra reliability.

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.071" for a 12.5" carbine. That is the cran spec for 556 out of a 10.X" barrel, go up to about .073" if you want to use .223 unsuppressed out of 10.X" carbine barrel. That Noveske is better than some but is still about two steps bigger than it could be. The Sionics RGP 11.5" is .071" and could go one step lower still. .065" or even .063" would be more like it for a 12.5".

My Noveske Recon 16" mid barrel will wobble a .082" drill bit in the GP, it will not fit a .086". Calipers say it's about .083" wide. Sionics 16" mid is right on at about .076" for reference (keeping in mind the mid gas port is not directly comparable to carbine location on the shorter barrels, since pressure is lower further down the barrel).

[Jwknutson17]

.071" for a 12.5" carbine. That is the cran spec for 556 out of a 10.X" barrel, go up to about .073" if you want to use .223 unsuppressed out of 10.X" carbine barrel. That Noveske is better than some but is still about two steps bigger than it could be. The Sionics RGP 11.5" is .071" and could go one step lower still. .065" or even .063" would be more like it for a 12.5".

My Noveske Recon 16" mid barrel will wobble a .082" drill bit in the GP, it will not fit a .086". Calipers say it's about .083" wide. Sionics 16" mid is right on at about .076" for reference (keeping in mind the mid gas port is not directly comparable to carbine location on the shorter barrels, since pressure is lower further down the barrel).

I agree it ideally should be smaller. All of my chop down 10.x-11.x SBR barrels started with carbine barrels with a .0625 ish port. This is where I would have liked to seen this barrel. Esecally if they do a 12.5, If it's .07 anything, I would surely pass.

[markm]

It's nice to see the intolerance of needlessly over gassed barrels spreading.

[Clint]

It's nice to see the intolerance of needlessly over gassed barrels spreading.

Yup, it's small gas port envy...

[tom12.7]

Yes, it is when it's applied appropriately.

[Iraqgunz]

We didn't port this for suppressed use only. The original requesting agency wanted a "smaller" port for suppressed use. We defaulted and still wanted it to work without a suppressor.

I agree it ideally should be smaller. All of my chop down 10.x-11.x SBR barrels started with carbine barrels with a .0625 ish port. This is where I would have liked to seen this barrel. Esecally if they do a 12.5, If it's .07 anything, I would surely pass.

[Kenneth]

Would it still be an advantage to use an adjustable GB with the reduced gas port of this barrel? I'm currently waiting for stamps to build a suppressed 11.5 and looking at barrels.


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[Rayrevolver]

I'd buy one.

I'd really like a lightweight version too.

My 11.5 bcm elw is going to spoil me.

A little off topic, but weight was another reason I rolled the dice on the 11.5 mid. Its 17oz and 0.625" at the gas block. And yeah, the original BCM 16 ELW kicked off the super light craze for me.