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Thread: Keyholing after pin and weld mb556k

  1. #21
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    It looks like it has no crown.
    If there is no enemy within the enemy outside can do us no harm

  2. #22
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    Personally, I would clean and retest with the same plethora of ammo. If it still has issues, then take it back to the smith once again, with a target showing the keyholes, and go from there. While he's not far off on the M855 QC statement, I think you've tried enough different types of ammo to rule out ammo as the singular cause. On a side note, I would not want an AR incapable of shooting any M855 or M193.

    Clearly, the smith didn't clean it, but that's not really what you paid him to do. Should he have cleaned it? Probably. It would have been nice since he was pinning a MD and that obviously makes it harder to clean, but I don't think that's an absolute indicator of poor work.

    The same crud that is there now is the same crud that was there prior to the muzzle device swap, so it technically shouldn't be the cause unless it had the same issue prior to the swap and you didn't notice. So, since it needs to be cleaned anyway, it only makes sense to clean it so you can rule that out as a potential cause.

    In your original post, I didn't see you mention anything about a suppressor, but you later stated the smith told you that there didn't appear to be any baffle strikes. My very strong suggestion, if you are shooting with a suppressor, you should stop until this gets cleared up.

  3. #23
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    I meant on the brake itself. I should have mentioned that I cleaned it before the range trip today and have yet to clean it

    Sent from my SM-N920V using Tapatalk

  4. #24
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    Push a tight patch through it and see if you can feel anything.

  5. #25
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    Quote Originally Posted by black22rifle View Post
    It looks like it has no crown.
    All barrels have a crown, even a barrel that's been crudely cut with a hacksaw. What varies is the shape and quality of the crown
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  6. #26
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    Could there be a shit ton of carbon build up on the crown then when the brake was installed a chunk of carbon came loose and now key holing is occurring?

  7. #27
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    There was a little but not enough to cause keyholing imo. The first picture was after the smith put on the break and was taken out and shot. The second was after cleaning and going out for a shoot. Both times there were keyholing 15 out of 100 rounds would key hole

    Update: took my rifle back to them and they said that there was nothing wrong with the break. It wasn't over tightened, off center or drilled to deep. The only thing that they could do was send it to lwrc and it looked like some one tried to put a bore sight or something that didn't fit down the barrel. I told them the only thing I ever put down the barrel was ammo, bore snake and cleaning rod for a 22.

    Tomorrow I am going to take it for a second opinion.

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  8. #28
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    does carbon buildup around the crown historically cause deviations at some point?

    I ask because I also have 14.5 pinned comp and a 16 with rock set that host a can and I'm thinking they have to be pretty bad.

  9. #29
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    Quote Originally Posted by mean_gene View Post
    Update: took my rifle back to them and they said that there was nothing wrong with the break. It wasn't over tightened, off center or drilled to deep. The only thing that they could do was send it to lwrc and it looked like some one tried to put a bore sight or something that didn't fit down the barrel. I told them the only thing I ever put down the barrel was ammo, bore snake and cleaning rod for a 22.

    Tomorrow I am going to take it for a second opinion.

    Sent from my SM-N920V using Tapatalk
    You need to take it to someone with a bore scope that knows how to use it. Sounds to me like your first guy is blowing smoke up your but.

  10. #30
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    Quote Originally Posted by GH41 View Post
    You need to take it to someone with a bore scope that knows how to use it. Sounds to me like your first guy is blowing smoke up your but.
    I'm taking it to a smith that hads been around for a while tomorrow.

    Quote Originally Posted by 13mike View Post
    does carbon buildup around the crown historically cause deviations at some point?

    I ask because I also have 14.5 pinned comp and a 16 with rock set that host a can and I'm thinking they have to be pretty bad.
    It does build up but not as bad as you would think also some of it comes off when you take that first shot after its been sitting for a while. I could be wrong but that's what I see in my ak74

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