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adjustable gas block

#3
Well, with a gas block journal of that size, your options are going to be limited. Of those mentioned, just pick one. I can say that the superlative arms block, when run in bleed off mode is more geared toward fine tuning than "fixing" an over gassed situation. When running an SA block, I often have to resort to running it in restrictive mode on rigs that are more than just a little over gassed.

Whatever you pick, if you shoot in any sort of volume, you will need to keep up with maintenance on the gas block because none of those listed are immune to carbon lock.

Unless you have a reason to be adjusting a lot, odds are that whatever you use, it will likely wind up being a set it and forget it thing. In that situation, you'd do just as well getting a less expensive set screw gas block, setting it and forgetting it.

Honestly, I wouldn't go adding an adjustable, unless I knew I needed it. Adding an adjustable to a properly gassed rig can cause problems because adjustables often leak gas.

Are you going to be running suppressed or something?
 
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#5
PRSDietitian said:
i'll run a APA little bastard half the time and a Vent 1 the rest of the time.
Paul ross is doing my barrel so i know the gas port will be properly ported.

will be running this with an H2 SCS for my buffer system
Click to expand...
I'm not super familiar with the AR10 world. I just have a good bit of experience with the AR platform in general and adjustable gas blocks. It seems that everyone wants one and I've seen more than one occasion where an AGB was used and it caused a perfectly good rig to not run so well due to all of the gas leakage.

If your guy knows what he's doing, I'd just let him do what he does and not worry about an AGB unless he recommends one.

Its too bad that riflespeed doesn't make one in that size. A riflespeed would be the ticket.
 
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#8
I like the SLR "linear" adjustments. For me, the adjustments are far easier to tune.

I will second what TonyAngel said about maintenance, however, all mine have been set and forget. IE, the various ones I have , are happy at 6 clicks open from closed ( of 15 clicks to wdie open available ) .

FWIW... 5 clicks open worked, and 1 additional click open for good measure. On 22" RLGS 6.5 CM's and 18" MLGS 308's . Heavy buffer setups and Tubbs flatwire 308 recoil springs.

And I haven't felt the need to adjust them since.

Make sure you have ample handguard clearance....

SLR "9" dimensions....

9C1.jpg


9S1.jpg
 
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#9
TonyTheTiger said:
If your guy knows his porting, there will be no more tuning left to do with an AGB.
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FWIW... I have only one LFAR barrel with a ( IMHO ) "appropriate" factory sized gas port. That one is a Krieger.

All the others... Criterion, Ballistic Advantage ( A let down of a barrel ) SOLGW, FN, PSA... have had "oversized" gas ports. Various lengths and gas lengths.

I have the gas port sizes written down somewhere, Lol
 
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#10
So I feel like an adjustable gas block is beneficial even with an appropriately sized Gasport, because even if you have a flow through suppressor, it does increase back pressure. And because I shoot both with a muzzle brake, and with a suppressor, being able to switch between the two settings is beneficial.
 
#11
PRSDietitian said:
So I feel like an adjustable gas block is beneficial even with an appropriately sized Gasport, because even if you have a flow through suppressor, it does increase back pressure. And because I shoot both with a muzzle brake, and with a suppressor, being able to switch between the two settings is beneficial.
Click to expand...
Maybe you should give the guy at riflespeed a call. He might have something for you. Seriously, the riflespeed gas blocks have been those very rare products that actually do what they say they will do.

I've been shooting high back pressure cans and run my rigs filthy, so I make adjustments on the fly as my rig gets sluggish from being abused. I've been running riflespeeds for quite a while now, I'm guessing coming around 2 years maybe. I've never had a problem. No carbon lock or anything freaky.
 
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#13
SLR for me, all day, every day. Whenever you go to the range, turn it up & down a few click & it won't freeze up, but it comes apart easily to clean.
But honestly, all the AGB's I've used, even some cheap ones, have worked just fine. A little high temp anti seize on the adjustment screw helps too. But all my guns /barrels are gassed pretty close to where they should be too, so that makes life easier.

MM
 
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#14
Of the three you listed, I've only used SLR. I think they're high quality and I like them for what they are but they definitely freeze up with carbon IME. And the only thing holding them on is two tiny little grub screws. So expect leaks.

As far as gassing the barrel "properly". It's only going to be gassed properly for one condition. Suppressed or unsuppressed. So, no fault to Ross but he can only do one or the other. If you do have a very low back pressure can I would definitely have it gassed for a brake and then just suck up the back pressure that a low back pressure suppressor will add. To me, the bigger evil is a poorly fitted adjustable gas block than a properly fitted non-adjustable gas block that doesn't choke down the extra gas. I think the standard two grub screw gas blocks are a liability and unnecessary weak point when you consider how much effort we're putting into other parts of the gun. If Ross could cut the journal to a slight thermal fit/ friction fit that would be ideal.
 
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#15
MontanaMan said:
SLR for me, all day, every day. Whenever you go to the range, turn it up & down a few click & it won't freeze up, but it comes apart easily to clean.
But honestly, all the AGB's I've used, even some cheap ones, have worked just fine. A little high temp anti seize on the adjustment screw helps too. But all my guns /barrels are gassed pretty close to where they should be too, so that makes life easier.

MM
Click to expand...
SLR here also…
 
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#16
JR1200W3 said:
Of the three you listed, I've only used SLR. I think they're high quality and I like them for what they are but they definitely freeze up with carbon IME. And the only thing holding them on is two tiny little grub screws. So expect leaks.

As far as gassing the barrel "properly". It's only going to be gassed properly for one condition. Suppressed or unsuppressed. So, no fault to Ross but he can only do one or the other. If you do have a very low back pressure can I would definitely have it gassed for a brake and then just suck up the back pressure that a low back pressure suppressor will add. To me, the bigger evil is a poorly fitted adjustable gas block than a properly fitted non-adjustable gas block that doesn't choke down the extra gas. I think the standard two grub screw gas blocks are a liability and unnecessary weak point when you consider how much effort we're putting into other parts of the gun. If Ross could cut the journal to a slight thermal fit/ friction fit that would be ideal.
Click to expand...
i'll ask if he has one on hand and can make the gas block journal like .001 oversized for a snug fit like WOA does
 
#18
JR1200W3 said:
Of the three you listed, I've only used SLR. I think they're high quality and I like them for what they are but they definitely freeze up with carbon IME. And the only thing holding them on is two tiny little grub screws. So expect leaks.

As far as gassing the barrel "properly". It's only going to be gassed properly for one condition. Suppressed or unsuppressed. So, no fault to Ross but he can only do one or the other. If you do have a very low back pressure can I would definitely have it gassed for a brake and then just suck up the back pressure that a low back pressure suppressor will add. To me, the bigger evil is a poorly fitted adjustable gas block than a properly fitted non-adjustable gas block that doesn't choke down the extra gas. I think the standard two grub screw gas blocks are a liability and unnecessary weak point when you consider how much effort we're putting into other parts of the gun. If Ross could cut the journal to a slight thermal fit/ friction fit that would be ideal.
Click to expand...
That's the rub. When setting up a rig for competition, you'll often setup the rifle to run as long as it needs to before cleaning, on as little reciprocating mass as possible so that you can run as little gas as possible and get less recoil. The downside to setting up a rifle like that is a sacrifice in flexibility.

The lighter the reciprocating mass, the more sensitive the system will be to changes in gas volume. The heavier the reciprocating mass, the less sensitive it will be to changes in gas volume. When tuning more for reliability and flexibility, tuning to run an H2 or H3 buffer to get you the right closed bolt lock time is the way to go, but you will get more of a recoil impulse.
 
#19
TonyAngel said:
That's the rub. When setting up a rig for competition, you'll often setup the rifle to run as long as it needs to before cleaning, on as little reciprocating mass as possible so that you can run as little gas as possible and get less recoil. The downside to setting up a rifle like that is a sacrifice in flexibility.

The lighter the reciprocating mass, the more sensitive the system will be to changes in gas volume. The heavier the reciprocating mass, the less sensitive it will be to changes in gas volume. When tuning more for reliability and flexibility, tuning to run an H2 or H3 buffer to get you the right closed bolt lock time is the way to go, but you will get more of a recoil impulse.
Click to expand...
I'm not really sure why you quoted me. It doesn't seem like you're thoughts have anything to do with what I posted.
 
#20
Actually, what I said was an extension of what you said. You made reference to the builder only being able to gas the rig to be able to shoot either suppressed or unsuppressed. The point that I was making was that it is a bit more involved or complicated than that. I guess maybe that just went over your head.
 
#21
TonyAngel said:
Actually, what I said was an extension of what you said. You made reference to the builder only being able to gas the rig to be able to shoot either suppressed or unsuppressed. The point that I was making was that it is a bit more involved or complicated than that. I guess maybe that just went over your head.
Click to expand...
I just don't want to have to guess at what you're trying to get at or interpret it in a certain way. The way I interpreted what you were saying is a round about reference to other posts that I've made about JP SCS systems. Additionally a person could also think that you're contradicting my post above about properly gassing for one condition versus the other by saying that you can use different buffers to bridge suppress versus unsuppressed.

It's pretty normal for a biased person to think what they're saying is so highly intellectually over somebody else's head, but when it comes out of their mouth they're just articulating it poorly.

And I disagree that you're going to solve gassing issues with different size buffers But I do agree that a condition called "properly gassing" includes the nuance of gas port size as a ratio to buffer weight. But you choose the buffer weight you want to run and then you cut the gas hole to match that. You don't cut the gas port randomly and then try to match buffers to smooth things out. Which is what's going to happen when you order just a barrel from a gunsmith. Which is why I think it's better to have a local gunsmith make the barrel with your complete rifle in hand so he can cut the gas port so it functions locked back on a mag with your entire assembled rifle.

I see a lot of arfcom migrants over focusing on buffer weights. I guess you're one of them
 
#24
It would be nice if Riflespeed would make a larger gas block. A +2 tube extends just in front of a 15" Seekins rail so a Riflespeed with the short flange (or whatever they're calling it) would be perfect. If we have to convince them to make a product for larger barreled precision rifles maybe we just go whole hog and skip 936 and ask for a 1" journal so we can have proper fat barrels 😂
 
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