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Thread: Blackout problem

  1. #1
    Senior Veteran automick's Avatar
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    Blackout problem

    Ive been looking at a budys 300blackout build.
    We cant get it to pickup the next round reliably.
    Have used two types of remington ammo.
    Also tried two diferent bolt groups...and diferent mags and lowers.
    It does a little better with the lighter rem bullit...but is single shot with the heavy round.
    Its a spikes barrel...clamp on gas block..carbine lenght gas tube.
    The port hole in the barrel is about 92 thousands.
    there are no signs of gas leaking anywhere. and all holes are clean and unobstructed.
    Any ideas would be great....thanks...atb auto.
    If its to bright....call ELLIOT LUCAS.!

  2. #2
    Senior Veteran Silvera's Avatar
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    Buffer and/or spring ???? Are you using a carbine stock or a full stock? carbine buffer or full? Check the buffer tube also for a defect.....is the detent and spring OK?
    "Listen With Your Eyes"
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  3. #3
    Buckshot's Avatar
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    You have tried different lowers and mags, so that most likely eliminate a couple of things I first thought of. I have noticed in some mags, like the PMag, (I thought) the shorter BLK rounds were sitting
    a little ackward. I don't know if it is a issue, but use standard aluminum mags which seem to hold the rds in a better position. The one I have has a Spike lower and is flawless, I never have had a misfire.
    Like it so well I got a 2d .300 upper yesterday for my new build. Is the bolt passing over the top of the rd? Strange, I have never heard of problems with them. Almost have to believe the problem is with the upper.
    Make sure you keep us posted , because I also want to know what the problem is. Sorry, not much help
    Last edited by Buckshot; 12-23-2012 at 09:42 AM.
    Occam's razor, the simplest explanation will be the most plausible

  4. #4
    Senior Veteran bladeworks123's Avatar
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    What buffer are you using? And have you lubed the bejeezus out of the BCG? Silvera is on the right track I do believe.
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  5. #5
    Senior Veteran automick's Avatar
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    Have used two carbine lowers...and my A2 lower.
    All shoot 223/5.56 no problem....and two bolt groups...that shoot 223/5.56 no prob.
    Also many pmags and aluminum mags that do fine in 223....also tried diferent charging handles.
    If its to bright....call ELLIOT LUCAS.!

  6. #6
    Senior Veteran bladeworks123's Avatar
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    Did you notice where it was throwing the brass?
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  7. #7
    Senior Veteran automick's Avatar
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    Good point blade.
    It seems to eject ok...brass comes out fine...maybe 2 or 3 feet to the side
    I would say at 4oclock.
    i did see one that didnt get out all the way with the heavy bullit.
    If its to bright....call ELLIOT LUCAS.!

  8. #8
    Senior Veteran bladeworks123's Avatar
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    I would say that you have one of two problems,,,,, under gassed or or too light a buffer. The carbine buffers on that heavier cartridge may not be keeping the bolt locked long enough to get the kind of gas you need for ejection. That combined with a small gas port size could be the combination too that is getting you. If the bolt head is not stiff and dragging from being new. Brass landing at four o'clock is a pretty good indicator that it's OK but that is not always an exact measuring stick either. No obstructions in the key or the tube?
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  9. #9
    Senior Veteran automick's Avatar
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    Im wondering what size the mushroom should be on the gas tube.
    and how far it should poke into the key in battery.
    If its to bright....call ELLIOT LUCAS.!

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