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Thread: Syrac Ordnance Adjustable Low Pro Gas Block

  1. #111
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    Quote Originally Posted by markm View Post
    Exactly. One click from wide open might cut gas 5%, whereas one click from a lower setting could cut flow in half.
    Yep. The reduction in gas flow is not linear.

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  2. #112
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    So if one was to build a MK18 Mod 1 clone with a cut down Colt 6920 barrel and would like to instal this gas block,

    1) would this it fit under a RIS II rail?
    2) what would be a good starting gas port size to allow adjustment for both suppressed and non suppressed shooting as well as using full power 5.56 and underpowered Russian stuff?
    "A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb

  3. #113
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    I'm fairly sure the Syrac set screw blocks will fit under the RISII. I'd start at 10 clicks from closed, unsuppressed with the weak ammo, and see what it does.

  4. #114
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    Quote Originally Posted by krichbaum View Post
    I'm fairly sure the Syrac set screw blocks will fit under the RISII. I'd start at 10 clicks from closed, unsuppressed with the weak ammo, and see what it does.
    I'm going to have to open the gas port in the barrel though, so I'm wondering how big before I would mount the gas block.
    "A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb

  5. #115
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    Doh! I didn't read it right. What size is the gas port now? I'd be hesitant to open it up until I tried it, unless it's really small. If you open it up, maybe 0.070" at the most. My 10.5" barrel has a 0.078" port and I'd prefer it to be smaller. Some of these other guys may have a better idea on that though.

  6. #116
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    Quote Originally Posted by OldState View Post
    So if one was to build a MK18 Mod 1 clone with a cut down Colt 6920 barrel and would like to instal this gas block,

    1) would this it fit under a RIS II rail?
    2) what would be a good starting gas port size to allow adjustment for both suppressed and non suppressed shooting as well as using full power 5.56 and underpowered Russian stuff?

    Yes, the gas block fits just fine under the RISII. I basically have a Mk18 Mod 1 clone. The Syrac is the same size as any other micro-sized gas block I've seen.

    Here's my GenII Syrac installed under the rail:


    I'm running the over-gassed (.083" gas port, I believe) DD 10.3" which is actually nice now that I have the Syrac. It gives me a wide range that I can get any ammo to function reliably. It ran Tula without issues when I was testing while still being able to adjust to run NATO spec ammo without being over-gassed. This thing runs amazing and smooth.
    Last edited by thecolter; 06-18-14 at 23:24.

  7. #117
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    Thanks guys. That is what I'm wondering. The barrel gas port is probably .062 since its a Colt. Its definitely going to be too small for unsuppressed shooting cut down to 10.3".


    Thanks for the pics BTW. That looks perfect.
    "A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb

  8. #118
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    What is the difference between the Gen 1 vs. gen 2? It seems Syrac only makes a gen 1 for .625 blocks...

  9. #119
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    Quote Originally Posted by PatrioticDisorder View Post
    What is the difference between the Gen 1 vs. gen 2? It seems Syrac only makes a gen 1 for .625 blocks...
    Gen 1 you had to push a detent and turn the screw at the same time.

    Gen 2 you just turn the screw.

    They make gen 2 in .650 Rainier Arms has them if not on the website call them. I know this because they sent me a .625 vs a .75

  10. #120
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    Quote Originally Posted by Djstorm100 View Post
    Gen 1 you had to push a detent and turn the screw at the same time.

    Gen 2 you just turn the screw.

    They make gen 2 in .650 Rainier Arms has them if not on the website call them. I know this because they sent me a .625 vs a .75
    Do you happen to have a link?... Basically what you're saying is the Gen 1's were just a wee bit more of a pain in the ass to initially tune, but otherwise function the same correct?

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