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  1. #1
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    300BO 10.5" Suppressed w/ Carbine Gas?

    Let's say I have a 300BO barrel that is Carbine gas, but only 10.5". I have heard several arguments both directions that while suppressed, it will either be extremely unreliable, or works fine.

    I understand the dwell time is probably way over the high side from an efficiency standpoint, but my hypothesis is that the reason some have no issues, while some do, is because of the gas port size.
    If I put the can on it, and it has intermittent cycling issues, would opening up the gas port help that situation? Or is the dwell time something that can't be overcome?

    Does anybody have any real world advice on this?

  2. #2
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    From the research I have done pistol length gas is the best all around system to run, for suppressed or un-suppressed with the 300 BO. I currently have a 16" 300 BO with pistol length gas that runs great with a can, I have on order parts to build a 10.5" 300 BO. My plan was to run the pistol length gas system but if I get trouble I will replace the fixed gas block with an adjustable one. As for dwell time I don't think the amount of gas has to much to do with it, it's all about the timing, if the casing isn't ready to be extracted more gas isn't going to help.

    Some good info in this thread.....

    https://www.ar15.com/forums/ar-15/-3...--/121-705771/

  3. #3
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    Quote Originally Posted by december1979 View Post
    From the research I have done pistol length gas is the best all around system to run, for suppressed or un-suppressed with the 300 BO. I currently have a 16" 300 BO with pistol length gas that runs great with a can, I have on order parts to build a 10.5" 300 BO. My plan was to run the pistol length gas system but if I get trouble I will replace the fixed gas block with an adjustable one. As for dwell time I don't think the amount of gas has to much to do with it, it's all about the timing, if the casing isn't ready to be extracted more gas isn't going to help.

    Some good info in this thread.....

    https://www.ar15.com/forums/ar-15/-3...--/121-705771/
    Thanks for the insight. However, if I had the choice of pistol gas, I would do it, but I don't.
    So you're thinking that the timing is too slow for carbine gas while suppressed? And opening up the port will have no effect? For hypothetical purposes, this barrel will never see Supers - Only subs while canned.

  4. #4
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    The only thing you can really do is go to a lighter buffer weight and/or spring.

  5. #5
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    Quote Originally Posted by GreaseMonkeySRT View Post
    The only thing you can really do is go to a lighter buffer weight and/or spring.
    That logic would point to the AMOUNT of gas, not the timing of the initial gas pulse. With that said, I'm tending to agree with you that a light buffer, a light spring, and an opened port for more gas can overcome the slow timing of the carbine gas, to a degree - Enough to cycle consistently by pushing the action "faster".

  6. #6
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    It may work, but I would bet on problems running it with subs. Opening up the port would have no effect because of the incorrect dwell time. I think that you may get it to work reliably but its going to be a long process of testing and buying new parts to try. Bear Creek barrels are on sale right now https://www.bearcreekarsenal.com/bar...300phb10-518-p


    http://www.calguns.net/calgunforum/a.../t-789737.html

    https://www.tngunowners.com/forums/t...-300-blackout/

  7. #7
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    Quote Originally Posted by december1979 View Post
    It may work, but I would bet on problems running it with subs. Opening up the port would have no effect because of the incorrect dwell time. I think that you may get it to work reliably but its going to be a long process of testing and buying new parts to try. Bear Creek barrels are on sale right now https://www.bearcreekarsenal.com/bar...300phb10-518-p


    http://www.calguns.net/calgunforum/a.../t-789737.html

    https://www.tngunowners.com/forums/t...-300-blackout/
    That is definitely a smoking deal.
    However, that particular barrel opens up a new argument - If you plan on running 100% suppressed with large grain bullets, you'll have trouble stabilizing some of them at the 1:8 twist instead of the 1:7.
    I'm just playing devils advocate here, as I am trying to learn the science of 300BO with it's intended purpose (300 Whisper), as opposed to the perceived black magic of what works as opposed to what doesn't.

  8. #8
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    Quote Originally Posted by GreaseMonkeySRT View Post
    The only thing you can really do is go to a lighter buffer weight and/or spring.
    This is what I do

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    Quote Originally Posted by DTruck View Post
    That is definitely a smoking deal.
    However, that particular barrel opens up a new argument - If you plan on running 100% suppressed with large grain bullets, you'll have trouble stabilizing some of them at the 1:8 twist instead of the 1:7.
    I'm just playing devils advocate here, as I am trying to learn the science of 300BO with it's intended purpose (300 Whisper), as opposed to the perceived black magic of what works as opposed to what doesn't.
    How I understand it the 1:8 twist rate is the preferred rate for short barrel suppressed. My 16" is 1:8 and seem to stabilize well and shoots great groups suppressed with subs.

  10. #10
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    Quote Originally Posted by december1979 View Post
    How I understand it the 1:8 twist rate is the preferred rate for short barrel suppressed. My 16" is 1:8 and seem to stabilize well and shoots great groups suppressed with subs.
    That's not what I've come across - but at the same time, 16" isn't short barrel. The 1:8 should do fine to stabilize heavier pills there, because it's a carbine length barrel.
    The way I understood it, was that going to a 10.5 or lower length, the faster 1:7 is preferred with heavy pills, but still the 1:8 with lighter supersonic pills.

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