Best "long term" adjustable gas block?

[Dan_Ortego]

This interest me too. I recently ordered a Wilson and I asked them about their adjustable gas block. They told me their SR config comes with a tuned gas block that would run with or without their Whisper Suppressor and to leave it be. I was told if I ran clean quality ammo such as their match grade stock I could go thousands of rounds without cleaning. Sounded a bit too good to be true but we’ll see.

[Sparky5019]

@MistWolf

You’re over-thinking it. The gas simply follow the path of least resistance. If that path takes it from the gas port and through the restriction created by the adjustable gas block and down the gas tube, that’s what it does. if the pressure in the bore drops enough, the gas will vent back into the bore.Gas flows through an adjustable block the same as it runs through a standard block.

The reason gas blows through the adjustment screw, out the gas tube roll pin and what have you is because are leak paths. It’s higher pressure gas following the path of least resistance. If the gas block were perfectly sealed, the gas would’t leak out at those points. And, as the AR adjustable gas block is restricting gas flow, there is no excess gas.

When the bullet uncorks the muzzle, the pressure does not just drop to nothing. It takes time for that gas to escape and vent. In fact, the gas system doesn’t pressurize until after the bullet has exited. The gas system runs off of residual pressure

Lol. I know. I see what you’re saying. Maybe a better way to put it would be that SLR has taken the leaks into account when designing their block do it leaks in a way that allows it to remain reliable and not seize up. I was thinking more into pressure gradients than path of least resistance. Thanks for bringing my ass back to earth. Lol.

[tom12.7]

@Plasman

Just to note, PWS has had a castle nut securing the gas block longer than Knight’s. It launched with the MOD1 series. When I got my SR-15 MOD2 upper I said, “Cool, it has the same gas block securing method as my PWS MK2.”

Also, the gas tube to block fitting on the MOD 2 is derived from liquid/gas fittings. I have a bunch of Swagelok ones at work.

Look at SR-25’s from the '90s, then tell me who came up with the method, KAC or PWS.

[krichbaum]

@BufordTJustice

Just curious, but were you using the melonited detent with the new black high-temp leaf spring, or was it the original spring with the non melonited detent?

The high temp spring came out about a month and a half ago.

Sorry…been away for a bit. The block in question was older so it wasn’t the latest iteration. Not sure which gen it was though.

[BufordTJustice]

@krichbaum

Sorry…been away for a bit. The block in question was older so it wasn’t the latest iteration. Not sure which gen it was though.

Gotcha. Thanks for taking the time to respond, brother.

[cst]

ive been following this thread with some interest…I wouldnt mind trying the Govnah block but alittle intimidated about messing with all the different plates to find the right one…its easier on a block like SLR…HOwever even SLR blocks arent invincible…I’ve had 5 fail in the last year…all from various generations…

The good thing is that SLR is constantly trying update the design and the CS is great! BUT in the end…an adjustable gas block with these types of design will never be approved to be put on any military issued gun.

Interms of set it and forget it…When I have my SLRs set at a minimal average opeining for most my ammo…I dont have to close it any further when shooting suppressed. Ive shot close to 200 rounds with no jams yet and brass isnt torn up. All with a standard BCG and buffer on my 556 and grendel.

Nothing would beat a Noveske Switch block type of gas block but they are severely limited in fine tuning the gas…As well as the bulk that prevents it to be used in many of the narrow profile handguards today.

[jerrysimons]

@cst

ive been following this thread with some interest…I wouldnt mind trying the Govnah block but alittle intimidated about messing with all the different plates to find the right one…its easier on a block like SLR…HOwever even SLR blocks arent invincible…I’ve had 5 fail in the last year…all from various generations…

The good thing is that SLR is constantly trying update the design and the CS is great! BUT in the end…an adjustable gas block with these types of design will never be approved to be put on any military issued gun.

Interms of set it and forget it…When I have my SLRs set at a minimal average opeining for most my ammo…I dont have to close it any further when shooting suppressed. Ive shot close to 200 rounds with no jams yet and brass isnt torn up. All with a standard BCG and buffer on my 556 and grendel.

Nothing would beat a Noveske Switch block type of gas block but they are severely limited in fine tuning the gas…As well as the bulk that prevents it to be used in many of the narrow profile handguards today.

Can you describe the failures of your SLR Rifleworks gas blocks what generation they were and what set up they were used with? Thanks

[Biggy]

I think I am going to try one of the 2A Armament lightweight gas adjustable carriers when they come out in around a month. The links below have some info on them.

http://www.ar15.com/forums/t_2_493/259011_Lightweight_Patent_Pending_gas_adjustable_carrier.html
http://www.ar15.com/forums/t_2_493/258846_A_few_images_of_one_of_TWO_lightweight_carriers_coming_out_soon_.html

[BigLarge]

@cst

ive been following this thread with some interest…I wouldnt mind trying the Govnah block but alittle intimidated about messing with all the different plates to find the right one…its easier on a block like SLR…HOwever even SLR blocks arent invincible…I’ve had 5 fail in the last year…all from various generations…

For the Govnah, start with the pre-drilled .046 plate. Get a numbered drill bit set ($20 from harbor freight), and slowly increase your drill bit size until you are satisfied. Repeat with the other 1 or 2 holes.

[Rayrevolver]

Another option from POF that I assume is new to the market? For. 750 gas blocks i still like the Govnah, baby Govnah, or BRT inserts. Or find a pinned
Noveske Switchblock.

http://www.rainierarms.com/pof-dictator-adjustable-gas-block-223-mid-length?utm_source=New%2FSale%20Email%208-21&utm_medium=Email&utm_campaign=New%20Email%208-21

cst - please post failures, I am interested in hearing about them.

[mig1nc]

Do the POF and Noveske vent gas like most other adjustable gas blocks?

Sent from my HTC One using Tapatalk

[MistWolf]

Are you asking if the adjustable gas blocks leak? Or are you asking if they use venting to reduce the amount of gas that goes to the BCG?

The SLR I’m using leaks, but it does not use venting to control gas flow. The SLR (and a far as I know the others as well) restrict gas flow

[mig1nc]

Yes, I guess leaks is the more accurate way to say it.

Sent from my HTC One using Tapatalk

[mpom]

Am quite certain my SLR Sentry 7 clamp on does not leak, at least around its contact with barrel, as I removed it and journal was completely clean, no trace of carbon. Now front end of gas tube did have some carbon deposits first inch or so, common in my limited experience. This makes sense, as clamping action allows gas block internal surface to pretty much mate to surface area of most of barrel journal. I know some folks dislike clamp on style, but as long as excessive torque on screws is avoided, they are not likely to shear. High temp moderate strength loctite (246) and witness marks are my insurance of gas block not moving.

[JC0352]

This thread makes me less willing to try an agb, even slr. Could one get a suppressed sbr to run without too harsh of a recoil impulse/gas to the face by simply using an A5 w/ the “right” buffer, green sprinco and an LMT e-carrier? Let’s also assume a surefire socom II is used, and the barrel is a 10.5" centurion arms lw chf bbl.

I mean before today’s gas blocks, carriers and charging handles, was it a complete miserable experience to shoot suppressed?

[BufordTJustice]

@JC0352

This thread makes me less willing to try an agb, even slr.

I mean before today’s gas blocks, carriers and charging handles, was it a complete miserable experience to shoot suppressed?

Answer: Yes.

[Shellen25]

I know I’m reviving this thread but I have SLR, Superlative Arms, and Syrac Gen 2,… had my first Syrac lockup last weekend - destroyed it trying to free it up, other Syracs were very difficult to break free, the SLRs were cake, and the Superlative Arms is newer but still very easy to turn…

I neglect them all equally so take that with a grain of salt but I will move away from Syracs to only SLR/Superlative

Sent from my SM-G935V using Tapatalk

[556BlackRifle]

@Shellen25

I know I’m reviving this thread but I have SLR, Superlative Arms, and Syrac Gen 2,… had my first Syrac lockup last weekend - destroyed it trying to free it up, other Syracs were very difficult to break free, the SLRs were cake, and the Superlative Arms is newer but still very easy to turn…

I neglect them all equally so take that with a grain of salt but I will move away from Syracs to only SLR/Superlative

Sent from my SM-G935V using Tapatalk

Unless something has changed, Syrac is out of business.

[fledge]

I thought superlative engineered the syrac gas blocks. Now they’ve improved on them and make their own.

[scooter22]

I think the BRT Micro Tune GB is the way to go.

Just my $0.02