Pennsylvania Firearm Owners Association
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  1. #11
    Join Date
    Feb 2010
    Location
    Levittown, Pennsylvania
    (Bucks County)
    Posts
    9,636
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    Default Re: Primer popping out

    In that case, is it a timing situation caused by overgassing?
    There are two kinds of guns. Those I have acquired, and those I hope to.

  2. #12
    Join Date
    Oct 2009
    Location
    Chalfont, Pennsylvania
    (Bucks County)
    Posts
    2,393
    Rep Power
    21474853

    Default Re: Primer popping out

    I thought about that. I have no idea what buffer is in the gun or what the gas hole size is.
    I assembled an AR for a customer with a custom barrel in 300blk. The barrel was a well known name.

    On test firing, it would not cycle. After finally tearing it apart, the gas hole was far undersized- I never checked it before assembly.
    In this case, I believe that ammo is .223 not 5.56. It is not particularly hot so unless there is a very oversize gas hole and buffer mismatch it's likely a soft, uncrimped federal primer.
    Crusader's local #556 South Central Asia chapter

  3. #13
    Join Date
    Mar 2010
    Location
    Monongahela, Pennsylvania
    (Washington County)
    Age
    34
    Posts
    262
    Rep Power
    222643

    Default Re: Primer popping out

    I appreciate all the responses. I rechecked headspace with 2 different bolts, and it seemed to be good. Ammo was factory Hornady Varmint 55 grain V-Max. I’ll have to recheck with 5.56 and see what happens.

  4. #14
    Join Date
    Feb 2007
    Location
    next to my neighbor, Pennsylvania
    Posts
    13,589
    Rep Power
    21474867

    Default Re: Primer popping out

    I didn't think ar's needed headspacing. Just install barrel and tighten.

  5. #15
    Join Date
    Oct 2009
    Location
    Chalfont, Pennsylvania
    (Bucks County)
    Posts
    2,393
    Rep Power
    21474853

    Default Re: Primer popping out

    They normally do not. What you think of as a barrel is usually a barrel and barrel extension- they're assembled by the manufacturer.
    You just stick it in your upper and tighten the barrel nut.

    I have been assembling AR's for 30 years and I can only recall a handful that have had headspace issues.
    Pretty amazing considering all the various manufacturers that have come and gone over the years.

    I've had and seen far more failures in factory ammo than AR headspace issues.
    Within the last week I opened a box of Federal .308M 168gn match. One of the rounds has the primer seated backwards, anvil out.
    Crusader's local #556 South Central Asia chapter

  6. #16
    Join Date
    Oct 2012
    Location
    Jim Thorpe, Pennsylvania
    (Carbon County)
    Posts
    675
    Rep Power
    2079673

    Default Re: Primer popping out

    I have to agree with cdi. Primers "Back out" for all kinds of reasons, and I thought that was what the OP was referring to until I saw the photos. That primer looks seated and has nice round edges. The only thing I ever saw that caused something like that was an oversize firing pin hole. Probably bad primers.

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