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Thread: Blown primers and other malfunction troubleshooting

  1. #21
    Join Date
    Dec 2011
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    Blown primers and other malfunction troubleshooting

    So I intentionally did absolutely nothing and was able to go shoot again. 90 unsuppressed rounds later, it was doing well and then in my last mag of the day, I had a dead trigger. Couldnít drop the hammer or move the selector to safe so I dropped the mag, racked the CH to expend a live round, and cracked open the receivers. Popped primer under the FCG.

    I think I was at 142 rounds for the day, all unsuppressed. The most significant part to me is that this was with different ammo - Igman .223. At this point, Iíve shot at least 500 rounds of that .223 and at least 200 rounds of MEN through other guns and this is the only one to have popped primers seizing the whole thing up. Only one of those was with the can mounted. Iím probably going to email Criterion and see what they think. Iíve heard different things about their CS so weíll see.


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    Last edited by Wake27; 01-29-23 at 20:32.
    Sic semper tyrannis.

  2. #22
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    This is sounding a LOT like a chamber issue. Being essentially a new barrel, I would suggest a good chamber polishing before sending the barrel back to Criterion.

    In the meantime, post some pictures of your fired brass if you get a chance. Any other pressure signs?
    ďYou have made us for yourself, O Lord, and our heart is restless until it rests in you.Ē -Augustine

  3. #23
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    Blown primers and other malfunction troubleshooting

    Quote Originally Posted by georgeib View Post
    This is sounding a LOT like a chamber issue. Being essentially a new barrel, I would suggest a good chamber polishing before sending the barrel back to Criterion.

    In the meantime, post some pictures of your fired brass if you get a chance. Any other pressure signs?
    Forgot to check that. Honestly forgot about trying out one of the E-carriers too. I had to pick up all of the brass though and didnít notice anything, though most of them were muddy.

    ETA - Criterion got back to me within about an hour and asked if Iíd headspaceís the bolt and gave me their specs for that. He took the time to talk through some stuff and then also recommended I check gas rings. I appreciate their handling of it so far, now I need to find a gauge thatíll measure to their spec.


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    Last edited by Wake27; 01-30-23 at 11:22.
    Sic semper tyrannis.

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