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Thread: Suppressed AR15 - Observations & tuning.

  1. #11
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    I have ran thousands of rounds through a Colt 10.3 in standard configuration using a SureFire SOCOM suppressor and have never had any cycling or other issues. No need to adjust gas, those suppressors were designed for use with standard Colt rifles.

    Piston guns seem to have issues with suppressors, point of aim point of impact being way off. There was a police department I dealt with who had PWS piston rifles and bought surefire suppressors. Well the shots were way off when they fired suppressed and they were convinced it was the suppressors, until they saw the suppressors ran on a military spec Colt rifle.

    I've had many bad experiences with AAC suppressors and steer people away from them when I can. Especially the handgun suppressors

  2. #12
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    Quote Originally Posted by Brahmzy View Post
    You need to look at the SLR titanium adj gas blocks.
    They're on a whole new level of reliability for FA/Suppressed fire.
    Even Syrac can't touch the reliability of SLRs latest Ti blocks.
    I've got one on my soon to be suppressed 11.5" Sionics with reduced size gas port. It will be my second SLR Ti adjustable block, the other is several thousand rounds in on my 18" faxon gunner profile with .081" gas port.

    As Brahmzy stated, it's wholly different and better than Syrac. I use barrel dimples, Knurled cup tip set screws, Resbond 907TS/Loctite red 271, and green Loctite 620 sleeve retainer on the gas block journal.

    Zero gas leakage. None. The fouling around the adjustment screw seals that up in under a hundred rounds. You can still adjust, but leakage virtually disappears after that.

    And you'd need a damn hydraulic press to get it off.
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  3. #13
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    Quote Originally Posted by IndianaBoy View Post
    To a point, yes I would agree with that. However there is a happy medium where a rifle is completely reliable unsuppressed while not being absurdly overgassed with a can. Especially with high quality, consistent ammo.


    While I use one on my 3-gun rifle, IMHO, adjustable gas blocks are the addition of a failure point. I think tuning with mass and springs can accomplish a portion of the same goals.
    Gotcha. OK that makes sense.
    For buffers and springs, would one of those heavy buffers and something like a Red Sprinco spring be enough to tame an overgassed beast?

    Quote Originally Posted by mic2377 View Post
    +1 to what IndianaBoy said. There is some latitude to where the gas setting that will allow safe, reliable function. Some configurations are more amenable to this than others, and some companies do a better job getting the gas port "right."

    An example of this is my 16" 300 BLK, which has a Noveske pistol gas barrel. Despite having a fixed/pinned block, it runs with 100% reliability in all configurations - subs/supers both suppressed and unsuppressed. There is no doubt that it is probably somewhat overgassed with supers/suppressed, but recoil is not excessive nor is the brass beat up. This is about the most extreme example possible but illustrates that adjustable gas is NOT absolutely necessary.

    There is no question that the adjustable blocks are less reliable.
    I have read this before about adjustable gas blocks.
    Having installed an SLR Sentry on my AR-10, I am curious what specific failures people have experienced - e.g. stuck adjustment screws, etc.

  4. #14
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    I'm not really in this game anymore, so I have no real dog in the fight.
    I have a strong preference to dedicated porting. Porting that gives other options is preferable to those that do not easily. I would much rather do a simple buffer swap to attain an intended goal than to go into other unknowns.
    A system is balanced out better in general for function overall, if that system has the option to increase or decrease action mass for prefered function.

  5. #15
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    Quote Originally Posted by ArmsUnlimited View Post
    I have ran thousands of rounds through a Colt 10.3 in standard configuration using a SureFire SOCOM suppressor and have never had any cycling or other issues. No need to adjust gas, those suppressors were designed for use with standard Colt rifles.

    Piston guns seem to have issues with suppressors, point of aim point of impact being way off. There was a police department I dealt with who had PWS piston rifles and bought surefire suppressors. Well the shots were way off when they fired suppressed and they were convinced it was the suppressors, until they saw the suppressors ran on a military spec Colt rifle.

    I've had many bad experiences with AAC suppressors and steer people away from them when I can. Especially the handgun suppressors
    Is that observation with the AAC can or the PWS? At 100 yards with a 10.4" barrel and a Saker 556, I'm about 1.5" from point of aim. That is from my HK MR556. My LWRC M6-SL is about the same and has a 16" barrel.


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  6. #16
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    Getting an AR to run properly is a balancing act. Yes, you can tame an over gassed beast with a heavier buffer and a stiffer spring, but excess gas is still vented at the receiver. A suppressor only makes the situation worse.

    It turns out Colt originally designed the gas system of the M4 to run with an H buffer, carbine spring and (if I recall correctly) a .0625" diameter gas port. Later, they switched to an H2 buffer for M4s with burst/full auto fire.

    Tuning an M4 to run on a heavier buffer, like an H3, means more gas to the face.

    I have an SLR adjustable gas block on a shorty AR and have put a few hundred rounds through it with no problems. I almost went with the Syrac, but fortunately, CoryCop firmly guided me to the SLR, for which I'm grateful. The SLR does have a couple more moving parts, but its usefulness far outweighs the added complexity
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  7. #17
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    I'm glad you found a setup that works for you. I would be interested to hear the details on which components you went with, particularly the barrel. Always nice to see mfg's properly sizing their gas ports.

    I hear what you're saying about the old straight set screw gas blocks... I had a JP on a .308 build, and it is nothing I would trust for a fighting rifle or anything like that... but I went with a SLR sentry on my recent SBR build, and it is a great design. It has detents with click adjustments, which solve the problems of the screw self-loosening, and allows for repeatable adjustments for switching between suppressed/unsuppressed.
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  8. #18
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    While I appreciate the understanding in function that some may have observed with adjustable gas blocks, I am less than convinced that there is a commercial product that could be issued for possible serious use.

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