I recently had a Superlative Arms adjustable gas block installed on my AR10, and I couldn't get the gun to work right. The instructions tell you to load one round in a mag and fire. If the bolt stays back, then adjust down until it doesn't, then go back up one. Well the first shot I took, the bolt locked back, so I adjusted down. The next round failed to eject, so I adjusted back up, but every time after that, it failed to eject, or if it did eject, the bolt didn't lock back. I adjusted all the way out and all the way in to test...same result. Did something get tweaked after the first shot? It's beyond frustrating...this is BY FAR the most expensive gun I own, and it gives me the most problems.
Adjustable gas block issue
- Thread starter gtodave
- Start date
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I would bottom it out in the closed-most position and then rotate it out 4.5 turns (fully open, unrestricted) and start from there.
At that point, moving it back inward will block off gas as a standard AGB would, but rotating it outward would begin adjusting the gas to the vented settings.
You should also feel tactile clicks between settings. Perhaps you are just stuck between settings?
I don't really mess with AGB's for this exact reason, but I do have one Superlative Arms AGB's on my wifes rifle in 5.56 (16 inch carbine length gas system HBAR). I could not get it to fail at any point a long the vented settings, so I have it running a few notches into the restrictive mode but that's it. Decided I wasn't going to run these anymore after my experience, just not worth it. But since I got it to run well, I am just going to leave it.
At that point, moving it back inward will block off gas as a standard AGB would, but rotating it outward would begin adjusting the gas to the vented settings.
You should also feel tactile clicks between settings. Perhaps you are just stuck between settings?
I don't really mess with AGB's for this exact reason, but I do have one Superlative Arms AGB's on my wifes rifle in 5.56 (16 inch carbine length gas system HBAR). I could not get it to fail at any point a long the vented settings, so I have it running a few notches into the restrictive mode but that's it. Decided I wasn't going to run these anymore after my experience, just not worth it. But since I got it to run well, I am just going to leave it.
alucard0822
For great Justice
Have probably 6 or 7 SA blocks. 2 are on Aero M5 AR308s. Easy way to adjust is to close it, then open it 4 clicks/1 turn, load 1, and make sure it locks open. if it does, add a click and done. If it doesn't then open 2 clicks at a time till it locks, add a click, then stop. Think both my 308s run perfectly at 5 clicks suppressed and 8 unsuppressed, usually leave them at 8 clicks and run fine with or without a can. Unless you want to chase the perfect setting they usually run well within a range of a few clicks, where a heavier buffer / AR10/A5/Rifle tubes have a wider range than a light buffer especially in the crappy AR15 tube/short DPMS buffer setup.
Check the block alignment. How is it mounted, clamp on, set screw, pinned? If it's set screw or clamp on, check that everything is tight.
This is what I was thinking. One shot does not always tell you your consistency. Plus if it moved after that or subsequent shots, it is under gassing from misalignment.
The other thing is, what was it doing before you installed the adjustable gas block? was it overgassed (which is the only time i"ve put one in).
- Jul 29, 2014
- 49,990
This^^^
Check the cheap shit before you go down the rabbit hole.
Didn't the gun work right before you changed gas blocks? Maybe it's not the block.
Why a Superlative GB? They're not known for the best reliability.
Boats
Broken Member
I too have several SA blocks and all have run great. The above info is what I have done as well.
Thanks for the replies. To answer the questions:
The gun ran great before. I've had the gun 10 years...it has lots of rounds through it.
I was shooting 147gr Winchester white box since I wanted the lightest loads to function in the gun too. I usually only shoot FGMM, and switched to that in168gr. No change in function.
I used SA because they were the only ones that had the size I needed in stock. Mine is an oddball size.
I put it on when I had a brake installed to help with recoil. I believe it was way over gassed...the damn thing was more violent than my .308 bolt gun of the same weight.
I haven't had a chance to check the alignment yet. That was my first thought as well, but haven't had time to check. I hope that's not the case, since it just came back from the gunsmith.
The gun ran great before. I've had the gun 10 years...it has lots of rounds through it.
I was shooting 147gr Winchester white box since I wanted the lightest loads to function in the gun too. I usually only shoot FGMM, and switched to that in168gr. No change in function.
I used SA because they were the only ones that had the size I needed in stock. Mine is an oddball size.
I put it on when I had a brake installed to help with recoil. I believe it was way over gassed...the damn thing was more violent than my .308 bolt gun of the same weight.
I haven't had a chance to check the alignment yet. That was my first thought as well, but haven't had time to check. I hope that's not the case, since it just came back from the gunsmith.
Well, I took it loose to check what I could...it appears to be lined up properly. I can't take it all the way off because of the muzzle brake, but I was able to feel where the ports were, and it appeared to line up. So I don't know what to do next.
- Jul 29, 2014
- 49,990
Maybe just a defective gas block.
How hard would it be to pull the brake and remove the block? You should be able to peak through into the block to make sure it is adjusting properly.
How hard would it be to pull the brake and remove the block? You should be able to peak through into the block to make sure it is adjusting properly.
Depends on how tight it is on there I guess. I don't know what they torqued it down to, but I may need a barrel vice.
- Jul 29, 2014
- 49,990
Hopefully they didn't use Rocksett on the threads. It isn't a suppressor QD brake is it? If you try and it doesn't seem to want to budge, call and ask if they did. If yes, you'll nead to soak it in water for a few hours to dissolve the glue.
- Jul 29, 2014
- 49,990
The easy answer is take it back to whomever did the installation.
If that is a problem, then you'll need to remove the brake to find out if the block is functional. The brake shouldn't have more than 20 f/lbs of torque on it. Stand the gun in a corner, muzzle down, in enough warm water to submerge the entire brake and give it a couple hours soak. It should come off without a lot of effort. That's assuming it wasn't pinned and welded(why would it be?) on.
What I do to check my gas block is, insert a casing into the chamber to block the airflow through the chamber. Wrap your lips around the barrel and blow to see if air comes out of the gas tube. Seems unsafe, but I live life on the edge! And it works. Also use mouth wash afterwards if you feel inclined.
This reminds me of the Schuster gas plug for my M1A. You open it until the rifle won't cycle then back it off a quarter turn. It helps when you're running 175 SMKs so you don't over gas the rifle and it extends the life of the op rod.
This reminds me of the Schuster gas plug for my M1A. You open it until the rifle won't cycle then back it off a quarter turn. It helps when you're running 175 SMKs so you don't over gas the rifle and it extends the life of the op rod.
Definitely not welded. It's a steel brake and a stainless barrel. I didn't see a pin at first glace, but I can't imagine they'd have done that. No need to make it permanent legally either, since it's a 20" barrel.
I taped a straw to one of those compressed air canisters and blew air in to the gas tube. Air came out the barrel both ends. I figured that was a little better than your method...I can only imagine the look on my wife's face if she came down and saw me with the end of a barrel in my mouth
I taped a straw to one of those compressed air canisters and blew air in to the gas tube. Air came out the barrel both ends. I figured that was a little better than your method...I can only imagine the look on my wife's face if she came down and saw me with the end of a barrel in my mouth
I wouldn't completely rely on that method. I did that when I put on an adjustable block and thought everything was fine. It had function issues and when I sent it up to Chad, he sent me a pic from his borescope where I was misaligned.
Teslong makes a good inexpensive borescope and it's helped me fix a couple friends rifles and helped me figure out that I made a mistake dimpling a barrel.
Yeah I'm going to look in to ordering one of those right now...no reason to not have one.
EDIT: Looks like they are pretty pricey!
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