300 blackout ejection problems

Discussion in 'AR-15 Discussion' started by Deuce31378, Aug 23, 2013.

  1. Deuce31378

    Deuce31378 New Member

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    300 blackout having problems ejecting round fully before next round trying to load. Shot 3 times with same result.
     
  2. Sniper03

    Sniper03 Supporting Member Supporter

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    Deuce,
    Tell us more! Did you purchase this upper or build it? Was a Weaver style gas block installed on it? Does it have an M-4 Cut barrel cut on it? Are you shooting full power ammunition or sub sonic? What stock and buffer do you have on it?

    03
     

  3. Deuce31378

    Deuce31378 New Member

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    I built it. It has a low profile gas block. It was built as a pistol, so it has a 10" barrel and pistol buffer tube kit. I was shooting full power ammo.
     
  4. duddie10

    duddie10 New Member

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    Could be a buffer issue. Sounds like its not cycling fully.
     
  5. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    What buffer? Weight? Spring? Could be under gassed.

    Does it cycle manually?
     
  6. Deuce31378

    Deuce31378 New Member

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    The pistol kit came with carbine spring and weight.
     
  7. duddie10

    duddie10 New Member

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    What kit is it? The buffer has a weight etched on it. Its hard to diagnose a problem with little info. How about a detailed list of your whole build. Lets start at square one.
     
  8. purehavoc

    purehavoc New Member

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    Are u 100% sure hour gas block is lined up with the hole ? Move your gas block back 1/16 " and try it again. Most barrels are drilled so that there is enough spacing for the hand guard attachment between the flat and the gas block . Measure how long the buffer spring is . They could have sent a rifle length spring which will cause this. How long is the buffer tube ? And most importantly before u do any of the above did you lube up the bcg well ?
     
  9. Deuce31378

    Deuce31378 New Member

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    *UPDATE*

    Problem solved. Switched to a heavy buffer and had to replace a faulty gas key. Fires without fault now. Thanks for all the help