Opinion on my gas block with suppressor setting

P&Y

P&Y

Member
I did some searching and got close to an answer but not exactly so I'd appreciate opinions. I was dialing down the adjustable gas block on my suppressed 22 Nosler and got all the way down to only 1/2 turn open and it was still ejecting and locking back.

I decided to leave it at that point. Curious if this sounds about right? I was surprised it kept locking back but had read it would be very over gassed to start. Thank you
 
I set my suppressed rifle up to where it just barely locks the bolt back 100% of the time.

Seems there is nothing stopping you from finding the ragged edge.

When you are way over gassed you can feel it. It feels as if the BGC is slamming the back of the buffer tube like a hammer. I suppose that is because it is.
 
With a TBAC U7 on my RRA ATH, with an Odin adjustable, it still locks back with the block adjusted as far closed as it will go. I left it open one click. Nice soft shooter, but can't adjust that block enough to prevent the bolt locking.

- DAA
 
Originally Posted By: DAAWith a TBAC U7 on my RRA ATH, with an Odin adjustable, it still locks back with the block adjusted as far closed as it will go. I left it open one click. Nice soft shooter, but can't adjust that block enough to prevent the bolt locking.

- DAA

Very helpful thank you
 
I have a Sig 556 suppressor on a 18" barrel mid length gas. Recently installed an adjustable gb. Closed halfway and brass still at 2 o'clock, closed it half of remaining adjustment. Have not shot at this setting, but will probably leave it there even if still throwing brass forward as it must run at below zero temps.
 
Does the brass land in a different spot depending on what direction you crank the gas adjustment? If not, the gas block may not be adjusting much if at all.

I have a Superlative Arms (formerly Syrac) adjustable on my RRA and couldn't get it to fail to lock back. I called and asked, the owner said as long as it adjusted the gas so the brass was landing back at the 4 or 5 oclock position then it was fine and don't worry about not being able to restrict the gas so much that it causes the bolt to not lock back. The product instructions say something totally different, but I guess the owner/designer knows best.

Apparently some adjustable gas blocks cannot shut the gas off. Some by design (SA) some because...? Could be poor design, could be some gas holes are just way too big.
 
Some gas blocks will not completely choke off the gas. Sounds like that is your issue.

I have run Anderson gas blocks that you can choke all the way off. But their availability is hit or miss.

But if your ejecting 4-5 and it's cycling, run with it. Should be ok.
 
It looks like P&Y's question was answered pretty well so i'll hijack the tail end of this.

Mo, what do you think about the Anderson adjustable gas blocks? I was going to order a few last year but couldn't get them. Ended up with some cheap Joe Bob's adjustables which work fine but I've not tried to change the gas setting since putting them on.
 

I joined the Predator Masters group years ago because I wanted to buy a suppressor.
At that time I was pointed to a Specwar 7,62. I bought one great suppressor.
They do not make them anymore because they were too heavy.
I have never had to buy an adjustable gas block. 223/5,56, 6,8mm, 243, 300BO, and 308/7,62.
My CZ 527 300 BO I can hear the firing pin fall. Pistol or carbine 7.5in to 20in
Here is a big thank you to all of you who told me to buy a Specwar.
I work's on my Bren 805, My CZ-Vz 58, and my AK type rifle.

ogwSH55.jpg
 
I run two and really like them on my 224 Valkyrie uppers (suppressed and not). Plenty of adjustment, will shut the gas off completely and a good price.



Originally Posted By: SubpaRIt looks like P&Y's question was answered pretty well so i'll hijack the tail end of this.

Mo, what do you think about the Anderson adjustable gas blocks? I was going to order a few last year but couldn't get them. Ended up with some cheap Joe Bob's adjustables which work fine but I've not tried to change the gas setting since putting them on.
 
Originally Posted By: DiRTY DOGDoes the brass land in a different spot depending on what direction you crank the gas adjustment? If not, the gas block may not be adjusting much if at all.

I have a Superlative Arms (formerly Syrac) adjustable on my RRA and couldn't get it to fail to lock back. I called and asked, the owner said as long as it adjusted the gas so the brass was landing back at the 4 or 5 oclock position then it was fine and don't worry about not being able to restrict the gas so much that it causes the bolt to not lock back. The product instructions say something totally different, but I guess the owner/designer knows best.

Apparently some adjustable gas blocks cannot shut the gas off. Some by design (SA) some because...? Could be poor design, could be some gas holes are just way too big.

My SA gas block will shut the gas off completely and turn the rifle into a single shot. I have 4 of them but I've only tried it on the one.
 
Might add, on mine, the block will stop it from running without the suppressor. But those couple shots just to see, are the only shots it will ever know without the can, it's never getting fired without one ever again.

- DAA
 
Originally Posted By: SubpaRIt looks like P&Y's question was answered pretty well so i'll hijack the tail end of this.

Mo, what do you think about the Anderson adjustable gas blocks? I was going to order a few last year but couldn't get them. Ended up with some cheap Joe Bob's adjustables which work fine but I've not tried to change the gas setting since putting them on.

I really like them. They are click adjustable, and they are not that much bigger than a standard low profile gas block, just a little bulge off to one side.

I would say that availability is one complaint that I have. They are reasonably priced, which is probably one reason they are hard to find sometimes.

I have never had one get stuck, they might get a bit stiff with carbon, but that's about it. They are easy to adjust and readjust.

When I do have problems finding them I will fall back with a Superlative Arms. I love their design too, but they are bit more pricey.
 
I have a similar situation with my 6.8mm. I closed the gas off completely and then turned the screw 360degrees back open. The sweet spot is right in there.

To adjust - I close the gas block completely with the screw turned all the way in. I open it up 360 degrees and fire one round. I can turn it back in 1/4 turn and it starts to not bolt hold open. Basically - the sweet spot is 3/4 a turn open from complete close (if that makes sense).

TC
 


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