Sionics 11.5 barrel w/ reduced gas port function report.

[Heavy-Metal]

There is only excess gas if the gas port is too large.

The best bet is to get a properly ported barrel from the start.

Awesome, well thanks I appreciate all the help and answering all my questions.

[BufordTJustice]

Very cool, and to aleviate some of the excess gas an adjustable gas block would be the best bet right?

Yessir. Ideally, starting with an optimized gas port is best, but there are several quality/reliable solutions to further adjusting gas flow. BRT has their microtune gas block and custom tune gas tubes. SLR has their AGB's as well.


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[BufordTJustice]

There is only excess gas if the gas port is too large, which is the case with the majority of mfgs.

The best bet is to get a properly ported and configured barrel with a standard gas block or Front Site Base from the start.

With that setup, an adjustable gas block is unnecessary except in special circumstances.


* A proper gas system configuration is one where the gas system length and barrel length are matched. For example 11.5" CAR , 14.5" MID, 20" RIFLE.

Jinx!

We're twinning today, apparently.


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[natehansen66]

New guy here. Just built a pistol with the 11.5 rgp barrel and an A5H2. I haven't seen anyone mention how these run with cheap steel case ammo, and I was afraid the H2 might be a bit heavy with the underpowered ammo. 400 rounds down without a hiccup....140 today outside in 9deg temp. Super sweet shooter!

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[markm]

Not surprising. The RGP should be called "Right Gas Port".

[MountainRaven]

These must be great barrels, since they're the only 11.5s Sionics isn't sold out of.

ETA: I typed the above by mistake and meant to type:

These must be great barrels, since they're the only 11.5s Sionics is sold out of.

[Iraqgunz]

Well they are done in smaller batches and they are a "special application". Not everyone believes in the concept.

These must be great barrels, since they're the only 11.5s Sionics isn't sold out of.

[MountainRaven]

Well they are done in smaller batches and they are a "special application". Not everyone believes in the concept.

Fair enough.

[Iraqgunz]

Not sure how I should interpret your two posts. It seems as if there is some agenda on your part. Maybe I am wrong.

Fair enough.

[OldState]

New guy here. Just built a pistol with the 11.5 rgp barrel and an A5H2. I haven't seen anyone mention how these run with cheap steel case ammo, and I was afraid the H2 might be a bit heavy with the underpowered ammo. 400 rounds down without a hiccup....140 today outside in 9deg temp. Super sweet shooter!

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This is good to hear. I’m in the market for a 11.5” barrel for a pistol thence SBR build that intend to run suppressed and unsuppressed. I would like to be able to run cheap ammo if needed. Also I’m heavily considering the new OSS suppressors which supposedly don’t cause anywhere near typical suppressor backpressure (was hoping for more reviews on that here but not sure anyone has one yet)

I don’t think I will be able to run an A5 stock setup, just a standard carbine buffer and spring