Need Adjustable Gas Block Suggestions for SBR build

[DenverDave]

I am building a SBR with a 10.5" barrel Carbine length gas system with a .750 GB dia. For this build I am going to use an adjustable gas block. I have been considering in order:

1) SLR
2) Syrac
3) Odin
4) Seekins

Anybody have experience with these adjustable gas blocks? Suggestions?

[MarkCO]

First I would say NO to adjustable gas on a SBR.

If you have to have one, you might look at the Noveske switchblock as it is rugged and designed for what you are doing with it. After that, MicroMOA has one where you can change out the throttling plates. It is more durable, kind of rebuildable and is what I would choose if I were building a carbine length adjustable gas system.

Adjustable GBs were originally designed for low mass systems with rifle length gas. When you double the pressure on a short gas system, none of the ones you have listed will last long term and most will leak and come out of how you set them in a few thousand rounds or less.

[Hoser]

223 or 300?

[Abomb5800]

Plus one on the Micro MOA. I run one on my suppressed 11.5". Just recently I went though a 1000+ round instructor course the the system ran flawless. Compared to my old Adams Arms piston, the MOA seems to be a bit louder but less blow back with the can.


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[davsel]

I installed a Syrac Gen II on a 7.5" pistol build. It was easy to adjust - adjustment screw on front, comes with long hex wrench, has 4 positive detents on adjustment screw for every revolution so no need for a set screw to hold its adjustment.
I just received an Anderson Manuf. adjustable block for my next 7.5" build - half the price of the Syrac, but have not installed it yet.

[asmo]

First I would say NO to adjustable gas on a SBR.

If you have to have one, you might look at the Noveske switchblock as it is rugged and designed for what you are doing with it.

^^^ this ^^^ I don't run adjustable gas blocks in any of my SBRs - suppressed or loud. Thousands upon thousands of rounds without issues.

[zimagold]

I have three Syrac Gen II gas blocks. 16" Midlegth 556, 16" Midlength 6.8, 8.5" 300BLK. I don't have personal experience with any failures. However, based on the design, I wouldn't be surprised if they failed after a few thousand rounds as mentioned by MarkCO. These are all range toys that I wanted to tune in for specific loads, I'll replace the block if it fails.

If you want reliability with minimal wear on parts for an SBR, I would get a barrel with an undersized gas port and have it drilled by a competent gunsmith for your preferred load.

[ChunkyMonkey]

Best value adjustable? Parallax gas block. Plenty in stock locally too ;)


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[YammyMonkey]

Mark,

Which part(s) wear out our fall in the SLR blocks? It seems like a more robust system than most since it doesn't rely on a tiny spring.

[Great-Kazoo]

One needs to remember there's a difference between "adjustable" gas blocks and ones for suppressors. The adjustable has the "potential" to come loose, and or not stay wher eyou set it. The suppressor style, like Noveske switchblock, Adams arms or other gas piston styles move to different positions and stay locked in with a detent or other means.

Nothing is exempt from failure, eventually................. Cardboard's maintenance Free................................ Till it Rains Out.

[MarkCO]

Mark,

Which part(s) wear out our fall in the SLR blocks? It seems like a more robust system than most since it doesn't rely on a tiny spring.

Still has a protrusion into the gas stream. If you are looking for low use and willing the disassemble and clean every 200-300 rounds, the SLR is a decent choice. The Micro-MOA Govnuh is the one that I recommend if you want durable and adjustable. The Noveske SB is robust, but not really adjustable, just with a few settings.

[SA Friday]

Don't do it. Adjustable gas block will be more problematic (and expensive) than just running an H2 or H3 with a Tubbs flat wire buffer spring to balance out the overpressure.