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Thread: New build Short stroking issue diagnose

  1. #21
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    The problem is that you don't have the requisite experience and knowledge to correctly troubleshoot this.

    Have you thoroughly inspected the rifle? Do you know if the carrier key is leaking? Do you know for sure that the gas block/FSB is not leaking? Do you know for sure that the gas tube and everything else is correct?

    If not, then you are going to be pissing in the wind.

    Quote Originally Posted by Xrob View Post
    Springs are the same length.

    I bought a new BCG for the windham/spikes build, it is an auto, like my original.



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  2. #22
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    Quote Originally Posted by Xrob View Post
    Springs are the same length.

    I bought a new BCG for the windham/spikes build, it is an auto, like my original.
    Put the original bcg back in the Windham upper and see if it runs. If it does you've isolated the issue down to the new bcg. Check the key for movement, ensure screws are tight/staked. Check key for obstructions. Ensure rings on the new BCG are sealing properly (put bolt in forward/unlocked position and stand the carrier on the head of the bolt. If the weight of the carrier is enough to compress the bolt, you need new rings).
    Semper Paratus Certified AR15 Armorer

  3. #23
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    Nevermind... ASH beat me to it.
    Last edited by Col_Crocs; 09-03-13 at 16:45.

  4. #24
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    On second thought, if it runs fine with 5.56 ammo as you said in your original post, shoot the gun some more with quality ammo and make sure it runs. No reason to replace working parts to make the gun shoot crappy ammo...that's called chasing a ghost.
    Semper Paratus Certified AR15 Armorer

  5. #25
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    Quote Originally Posted by ASH556 View Post
    On second thought, if it runs fine with 5.56 ammo as you said in your original post, shoot the gun some more with quality ammo and make sure it runs. No reason to replace working parts to make the gun shoot crappy ammo...that's called chasing a ghost.
    I'm going to swap BCG's next, if it still has issues with the cheap ammo, I will just keep using the 556 and see what happens after a case.

    Im Positive the FSB isn't leaking and you all say the tubes are the same, springs are the same, so the BCG is the difference.

    Both BCG's are basically new and bolts and rings are too. And the staking and key are not moving or blocked, Mia-aligned
    Last edited by Xrob; 09-03-13 at 17:03.

  6. #26
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    Re: New build Short stroking issue diagnose

    Quote Originally Posted by Xrob View Post
    I'm going to swap BCG's next, if it still has issues with the cheap ammo, I will just keep using the 556 and see what happens after a case.

    Im Positive the FSB isn't leaking and you all say the tubes are the same, springs are the same, so the BCG is the difference.

    Both BCG's are basically new and bolts and rings are too. And the staking and key are not moving or blocked, Mia-aligned
    It's possible that the new BCG just needs a little breaking in, which can be accomplished by running a few hundred rounds of good 5.56mm ammo through it. Do you notice any more resistance when moving the bolt in the new BCG? I have found that some of my uppers become more ammo tolerant over time as the parts break in.
    Last edited by mtdawg169; 09-03-13 at 17:09.

  7. #27
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    Quote Originally Posted by mtdawg169 View Post
    It's possible that the new BCG just needs a little breaking in, which can be accomplished by running a few hundred rounds of good 5.56mm ammo through it. Do you notice any more resistance when moving the bolt in the new BCG? I have found that some of my uppers become more ammo tolerant over time as the parts break in.
    I believe this may be it too. When I cycle manually, you can feel the drag from the new BCG, like little lines from machining or something.

  8. #28
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    Quote Originally Posted by mtdawg169 View Post
    It's possible that the new BCG just needs a little breaking in, which can be accomplished by running a few hundred rounds of good 5.56mm ammo through it. Do you notice any more resistance when moving the bolt in the new BCG? I have found that some of my uppers become more ammo tolerant over time as the parts break in.
    Which is why I polish the railed surfaces on the BCG w/220 grit sandpaper. Makes the interface b/t the upper and bcg MUCH smoother.

    -Jax


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