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Ar-15 experts step in please..

Discussion in 'Gunsmithing & Repairs' started by Hworth18, Aug 30, 2018.

  1. SMS

    SMS Sharpshooter

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    He stated he was using PMC. I didn’t think PMC made steel cased ammo.
     
  2. lasher

    lasher Sharpshooter

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    PMC is good ammo, very good. i've never seen a steel case with PMC headstamp.
     
  3. MacFromOK

    MacFromOK Sharpshooter

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    Me neither, nor do I intend to. I prefer a softer metal wearing against the steel in my firearms.

    YMMV. :drunk2:
     
    dennishoddy likes this.
  4. Old Phart

    Old Phart Sharpshooter

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    I've never had a problem using steel cased ammo in an AR. Maybe I'm just special like that.
     
  5. Defcon Shooter

    Defcon Shooter Sharpshooter

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    keep it long enough you will. I see it every week. stuck cases and junior gun plumber bolt destroying techniques. Ther is simply not enough taper to the case in 5.56 for it to be a good candidate for steel cartridges.7.62x39 is fine because of the rapid body taper. The lack of strong primary extraction on stoner rifles is not conducive to steel ammo.
     
  6. Old Phart

    Old Phart Sharpshooter

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    Probably so. If you keep and use anything long enough you'll more than likely have some kind of problem with it. Stuff wears out. When it does, I replace it.
     
  7. Defcon Shooter

    Defcon Shooter Sharpshooter

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    The Colt Gold Cup I have been shooting for 35 years now works better than when new. Although the worn off corners and holster worn metal don't look near as good.
     
  8. mouthpiece

    mouthpiece Sharpshooter

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    What size is the gas port?
    Is the bolt locking back on last round?
    What weight buffer are you using?
    The answers will help diagnose your problem.
     
  9. Fyrtwuck

    Fyrtwuck Sharpshooter

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    From your description, it could be several things or a combination. The bolt is cycling enough to load the next round, yet not pushing back far enough to engage the bolt hold open on the last round.

    Weak ammo
    Bad magazines
    Lack of lubrication
    Under gassed
    Bad extractor
    Gas rings on the bolt
    Loose carrier key
    Weak extractor spring
    Incorrect buffer weight
    Buffer spring is too strong

    You just have to work your way through each of the possible causes till it works like it’s supposed to.
     
  10. Hworth18

    Hworth18 Marksman

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    Thanks for the responses. I don't shoot steel case ammo, only brass and I'm using brand new Gen 2 Pmags. Swapping out the BCG seemed to fix the problem but I'll keep it well lubed and running quality ammo until it's broke in.
     
    dennishoddy likes this.

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