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Thread: Over-gassed 11.5.. cut to 10.5 help at all??

  1. #151
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    Quote Originally Posted by Magic_Salad0892 View Post
    Thank you very much for taking the time to answer my questions.

    It would be greatly appreciated though if you could post pictures of what he ports on the plate looked like after the several thousand rounds of M855. With measurements if possible.

    Also, if you don't mind me asking a few more questions:



    Why would this limit rail compatibility? (This actually does seem like a really good design.)

    Also.

    What kind of steel are the gas block, and plates made out of? I must have missed it if you posted it.
    Unfortunately, I did the testing torture testing with the M855 over a year ago and I have no idea where that plate is. I just know that the port was still very good....the next numbered drill bit size wouldn't fit into the plate.

    The plate is 5/8" wide so the odds are that it will hopefully line up with some ventilation hole/slot in brand 'x' rail system. Some rails you can barely get a bullet in there to get to the regulator and it is just a push. If now you had to also go forward, I am just concerned that the bullet would hit a 'hard stop' in the rail system where it would just happen to line up so you may not be able to push forward on the leg of the spring.

    Again, this product has been out since October and I have yet to have anyone experience an unintended regulator plate shift. We purposely made the detent pin a little long to accommodate a longer detent groove in case that need did arise and it would just be a plate swap.

    The block body is 416 stainless.
    The regulator plate is 4130
    The above material info is on the website but I put 41xx for the plate material because I had a feeling it would vary between 4130 and 4140 depending on our source but current production is 4130.

    No problems on all the questions. Ask all you want.
    Last edited by MicroMOA; 01-22-13 at 10:50.
    President of MicroMOA and a corporate member of Artisan Arms

  2. #152
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    Quote Originally Posted by MicroMOA View Post
    Unfortunately, I did the testing torture testing with the M855 over a year ago and I have no idea where that plate is. I just know that the port was still very good....the next numbered drill bit size wouldn't fit into the plate.

    The plate is 5/8" wide so the odds are that it will hopefully line up with some ventilation hole/slot in brand 'x' rail system. Some rails you can barely get a bullet in there to get to the regulator and it is just a push. If now you had to also go forward, I am just concerned that the bullet would hit a 'hard stop' in the rail system where it would just happen to line up so you may not be able to push forward on the leg of the spring.

    Again, this product has been out since October and I have yet to have anyone experience an unintended regulator plate shift. We purposely made the detent pin a little long to accommodate a longer detent groove in case that need did arise and it would just be a plate swap.

    The block body is 416 stainless.
    The regulator plate is 4130
    The above material info is on the website but I put 41xx for the plate material because I had a feeling it would vary between 4130 and 4140 depending on our source but current production is 4130.

    No problems on all the questions. Ask all you want.
    Thank you very much.

    I don't have any more questions, but if I do, they'll be in this thread so everybody can read them. And I do think they are relevent to the topic.
    We miss you, AC.
    We miss you, ToddG.

  3. #153
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    Quote Originally Posted by MicroMOA View Post
    Good question and one that we have anticipated before releasing the product. We tried several detent pin depths before settling on what we have now. We have done testing where the rifle was thrown on the ground with no change. Now we haven't thrown it out of a helicopter but I would think you would need a complete evaluation of the firearm if you did that.
    Agreed, I dont think helicopter testing is necessary at this point! Im glad to hear this was considered in development and makes me more confident in purchasing.

  4. #154
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    Below are some pics of the barrel I was talking about a few posts back.
    8" Bulgarian AK-74 chrome lined barrel that was modified for the AR platform.


    Close up of the top of the barrel's gas port:


    Picture below is of a .099" drill bit in the gas port. The gas port isn't even round so it is hard to quantify how big it is.


    Putting a standard gas block on, this upper wouldn't even run properly due to the severe overgassing.

    So you can imagine going from a port that is over .099" (since it isn't round) down to a .073" port in the Govnah regulator plate that erosion would occur pretty quickly especially when it was all full auto mag dumps with 45 round mags firing corrosive, abrasive, steel core 5.45. However, even after approximately 2k rounds, the top of the regulator plate was still good. Next drill bit size is .076 and that wouldn't fit.

    Again, this is just worse case scenario. That barrel should not be in service anymore. The point is that the Govnah was able to get that barrel to function properly even with such a messed up gas port in the barrel.
    Last edited by MicroMOA; 01-23-13 at 12:58.
    President of MicroMOA and a corporate member of Artisan Arms

  5. #155
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    Thanks for the pictures. They really do help give a clearer picture.
    We miss you, AC.
    We miss you, ToddG.

  6. #156
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    Nice to see all these new options for tuning gas flow.

    I really wish I had asked Robb to measure the port on my 11.5" DD barrel when he had it all apart.
    Its running with an H2 buffer and Blue Sprinco, cycling Steel cased ammo just fine. (Forgot to try the H3 last time out)

    I have a Surefire 212 can on the way. Makes me think I could use a little less gas flow.

  7. #157
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    So i have two of these gas blocks and I must say I'm pretty impressed with them.

    Here are the specs on the 1st one:
    -16 in Mid length BCM SS410
    -H2 Buffer
    -Used with an Ops Inc 12th Model can (barrel was modded by ADCO to fit the collar for the Ops Inc.

    I've got about 500 rounds through this setup. About 100 of them have been suppressed. It is totally awesome. I'm one of these guys that is obsessed with taming the over gassing of a gun when it comes to running a can. I also have the Syrac adjustable gas block. That is awesome as well but is more for guys who want to "tune" their guns. I'm pfretty much just going back and forth between suppressed and unsuppressed.

    No issues with it fitting under my Centurion Rail. Will also fit under a Troy VTAC as well.

    The gun will short stroke when it is in the suppressed setting and there is no can on the gun... as it should...

    The recoil is hardly noticeable when running a can on the rifle.

    The next set up I have is:
    -BCM BFH 14.5 Mid length.
    -Surefire Mini Monster

    Have this one under a KAC URX 3.1 rail with no clearance issues either.

    I have not had a chance to head out and shoot this but I will certainly post once I do so.

    My only complaint is that the set screws do not match up with the standard location of the gas block dimple on most barrels. I get why they did this... So you can line up the gas block exactly where it needs to be in case you have an out of spec gas block dimple.

    With that being said... Most guys that spend 150 bucks on a gas block aren't buying crappy barrels... where there could be spec issues... I buy BCM barrels so I'm not really worried about any issues.

    So that would be my only suggestion to MicroMOA.. Stick with the standard gas block dimple location.

    Feel free to PM me with any questions. I'll also try and get some pics up here soon...
    Last edited by pathfinderheli; 01-30-13 at 14:58.

  8. #158
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    Quote Originally Posted by pathfinderheli View Post
    I also have the Syrac adjustable gas block. That is awesome as well but is more for guys who want to "tune" their guns. I'm pfretty much just going back and forth between suppressed and unsuppressed.
    I have that Syrac sitting on the shelf. I'm dying to try it, but the gun I was going to use it on, I NAILED with the port insert.

    I can see how a quick changeable system would be optimal for going suppressed and unsuppressed a lot.
    "You people have too much time on your hands." - scottryan

  9. #159
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    Quote Originally Posted by markm View Post
    I have that Syrac sitting on the shelf. I'm dying to try it, but the gun I was going to use it on, I NAILED with the port insert.

    I can see how a quick changeable system would be optimal for going suppressed and unsuppressed a lot.
    Any idea what caused that one port insert to vanish? The insert will have a lot of pressure on it, so I'm a bit concerned about it staying in place. I love the idea of the insert versus the Syrac. I'm concerned about the Syrac adjustment screw getting chewed up by the gas, but I guess the insert might erode just as fast.

  10. #160
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    Dwell time

    Quote Originally Posted by C4IGrant View Post
    Cutting the barrel down a full inch is about the same as changing the GP size from say .060 to .058 IMHO.


    C4
    It is not like changing .002", It is going to change your dwell time about 100 ms. Which will intern reduce the amount of gas to the system.

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