I have a BCM 11.5" that I’d like to put an adjustable gas block on. The rifle just gets too “gassy” for my liking when suppressed. It has a LW barrel so a .625" gas block is needed.
I’ve heard many good things about Syrac. My main criteria is durability. I don’t want to have to remove the rail and clean it every 500 rounds. That’s like one day of shooting. I’d prefer to never have to clean it. Ease of adjustment and price are distant secondary criteria.
What works?
This also interests me, as I embark on my next build (10.5" Noveske AR Pistol). From the limited research I have done, adjustable GB are met with mixed reviews.
I have an SLR series 6 Adj .625 gas block and am very satisfied.
Great design and top of the line.
Based on member reviews I also have a .625 SLR gas block for a new barrel that is incoming.
If I needed a .750 gas block I would look real hard at the Govnah. Its a little heavy but seems like a no brainer with respect to durability. I asked if they were making a .625 Govnah and the short answer was no.
This post is useless.
By any chance, do you know the gas port size of that barrel?
I’ve used a few linear adjustable gas blocks, but they aren’t a long term part or affordable or compact.
Are you out of possible options that eliminate the use of more action mass?
I have been in a similar pursuit for a while, without good results. I am not sure a commercial model exists yet.
I know it may seem like I’m a MicroMOA fanboi, but I just really like their shit.
If you know your ideal gas port (and MicroMOA can help you figure that out), then this may be the ideal solution for you: http://micromoa.com/baby-govnah/
Dood, he said .625" so Govnah and Baby do not work.
Sorry Euro, we are not being helpful. I posted the review of the SLR above. I like that there is no spring and detent, I hear they bind up. It uses a leaf spring instead that is serviceable.
Also, there is a flat so the set screw option can be drilled and pinned (don’t know about the clamp version). Adco said they would pin it, that is my plan for a suppressed only upper.
Simple. I just installed an SLR .625" Sentry 6 Titanium set screw gas block on my Faxon 18" gunner profile barrel. About 700 rds through it so far. With their new black high temper (and high temp rated) detent spring, I couldn’t recommend anything else.
I had several thousand (2.2k) through a previous generation Sentry 7 .750" set screw in SBN 4140 and it’s still running strong. Just sold that to a buddy the other day.
The owner of SLR tests all his AGB’s on suppressed setups as part of routine product development.
I couldn’t dream up a bad thing to say about Syrac AGB’s if I tried, but SLR has been working great for me.
Damn, I stand corrected. My mind went straight from thinking about .625s to the “simple” part of the deal and failed to return home.
Thanks for the info guys.
I know there are many folks with experience using adjustable gas blocks but I’m just looking for objective information such as “I have xxx number of suppressed rounds through it and I adjust the setting every xx rounds after switching to u suppressed use” etc etc
I just adjusted the Sentry 7 in the barrel I sold within the last 100 rounds i fired through it. Well over a thousand unsuppressed rounds (mostly federal xm193, with a few hundred rounds of tula 55gr) before the last adjustment before that.
No issues changing gas settings. It was a little sticky on the first movement, but by the second notch, it was normal. This was with the std temp leaf spring, not the newer high temp black spring.
That’s all I got. Lol.
I’ve been using an SLR on my 10.5 Wolf Pup. I don’t know how many rounds I’ve got through it, but it’s several hundred and it’s not babied. No suppressor. I’ve never had the adjuster seize up and it always turns without undue effort, but I do occasionally hit the leaf spring and set screw with a little Frog Lube. It works good enough with a standard carrier and works even better with an LMT enhanced carrier. There is carbon fouling around the gas block which is evidence the gas block leaks a little through the three slots of the set screw and from around the leaf spring. However, I can’t say the leakage has ever affected reliability
This picture is after about 180 rounds. The recently improved adjustment screw has very little leakage. This is actually the std spring. I bought mine a week prior to the black spring release. SLR sent me a free black spring anyway.
Are you wanting to adjust gas up and down or do you really just want a smaller fixed gas port?
Those are two different but related things.
Markm used our CustomTune Gas Ports with good success on his 11.5" upper that had a huge gas port.
These thread into your existing gas block or FSB and are available in a variety of sizes.
The .070" is great for normal / mixed use and .060" for dedicated suppressed use.
Once installed, there are no moving parts and there is nothing that needs maintenance or cleaning, just like an original factory gas port.
Again, thanks for all of the info guys.
I previously owned a dedicated suppressed AR. It was a 16" carbine cut to 10.3" without gas port work. Unfortunately it would not function unsuppressed. I do not want to go down that road again and that is the reason I bought the 11.5" BCM in the first place.
I want adjustability, but I’ll settle on a fixed product if I can just get this gas out of my face. This never used to bother me because my shooting was done outdoors while moving and around a breeze but due to my hectic schedule lately I’ve had to do some gun fun indoors and it is downright painful to shoot more than a few rounds suppressed
The goal is to stop the gas, and have the rifle remain functional unsuppressed and suppressed. Whether that is done by an AGB or a method of stopping the gas from seeping out of the upper and into my eyes is irrelevant to me. Reliability is paramount, however.
I think Syrac and SLR Rifleworks especially, would both be up for the task. SLRs design has got to be the most robust out right now.
My BCM 11.5" has a .076" gas-port.
Eurodriver, I suggest you combine the adjustable gas block with the LMT enhanced carrier. Tested back to back in 10.5 inch upper, my initial findings are that the LMT Enhanced Carrier allows for finer tuning and operates with less gas than a standard carrier
I’m not convinced that choking down the gas port flow, by whatever means, will reduce gassiness. I don’t have a wide sample to draw from. But it seems I can still remember a certain amount of gas… even when tuned to dedicated suppressed levels.
A certain amount of gas will still flow out of the chamber and ejection port. If you ever pull the bolt/bolt group on a recently fired suppressed barrel, you’ll notice that you can’t even see down the bore because of the thick, nasty gas lingering in the barrel.
If that’s true, then what is the best way to eliminate the gas that gets in your eyes when firing suppressed? Aside from the normal “It doesn’t bother me”, “suck it up”, “don’t be a pussy”, etc?